Why a Classification System Exists
Every significant residential building in Manhattan belongs to a type. The type is not merely an architectural category. It determines the board approval process, the material vocabulary of existing renovations, the relationship between the architect's design intent and the owner's intervention rights, the Landmarks Preservation Commission's jurisdiction, and the range of renovation scopes that are practically achievable. Understanding a building's typology is the prerequisite for any serious design, renovation, or purchase decision.
This taxonomy classifies Manhattan's 50 most significant residential buildings across five design registers. Each register is defined by a combination of construction era, architectural intention, governance structure, and the design conditions it creates. The buildings within each register share design implications specific enough to constitute a coherent operating framework. The classification system is intended as a working reference — for designers orienting to a new building, for buyers evaluating renovation potential, and for anyone who needs to understand what type of building they are actually dealing with before making decisions within it.
The Five Design Registers
Pre-War Classical encompasses buildings constructed before 1940 in classical architectural styles — Italian Renaissance, Victorian Gothic, Beaux-Arts, Art Deco — that were designed as permanent residential architecture and whose original architectural character defines the primary design context. Most are cooperatives with rigorous board approval processes. Interior specifications vary entirely by unit and by the renovation history of each owner.
New Classical encompasses post-2000 new construction in the classical and limestone tradition, primarily but not exclusively by Robert A.M. Stern Architects. These buildings provide strong developer-specified baselines in British bespoke kitchen cabinetry, premium European appliances, and marble baths. They are almost universally condominiums with alteration agreement processes rather than co-op board votes.
Starchitect Contemporary encompasses post-2000 new construction in which a Pritzker Prize winner or architecturally world-renowned firm designed the building as a primary design statement, typically extending their design authorship to all interior surfaces. The architect's design language IS the product, and renovation must navigate its existing internal coherence.
Historic Conversion encompasses pre-war industrial, commercial, or institutional buildings — warehouses, printing houses, skyscrapers, hotels — converted to residential use. The original building's bones (structural timber, masonry, proportions, window configurations) are the primary architectural asset and the primary renovation constraint.
Luxury Contemporary encompasses post-2000 premium new construction where the developer's specification provides a strong baseline, but no single architectural vision dominates. Freedom is real; discipline is required.
Pre-War Classical: Six Buildings
998 Fifth Avenue (McKim, Mead and White, 1912; cooperative, 17 units, $20–40M). The Italian Renaissance palazzo that created the Fifth Avenue co-op tradition. Design implication: The most selective co-op board in New York, Landmarks designation, and palatial room counts (up to 28 rooms per unit) mean renovation is an institutional process requiring the discipline of a landmark public project. Museum-quality art integration is the expected standard.
834 Fifth Avenue (Rosario Candela, 1930; cooperative, 34 units, $10–44M). Candela's Art Deco/Classical limestone masterwork, the Rockefeller building. Design implication: Candela's black-and-white marble mosaic bathroom floors, dark walnut herringbone parquet, and formal room sequences are architectural arguments — preserve or deliberately replace with equivalent conviction. Board approval among the most rigorous in the city.
The Dakota (Henry Janeway Hardenbergh, 1884; cooperative, 65 units, $3–40M). New York's most legendary co-op address, Victorian Gothic. Design implication: Wide-plank American longleaf yellow pine floors are irreplaceable — a material commercially extinct for decades. Period encaustic tile and Victorian plasterwork are primary architectural assets. The board's institutional authority is among the most exacting in Manhattan.
The Apthorp (Clinton and Russell, 1908; condominium, 163 units, $1.5–25M). John Jacob Astor's full-block Italian Renaissance palazzo with theatrical porte-cochère and private courtyard. Design implication: Interior specifications vary dramatically across 163 units — original Astor-era elements (plaster moldings, marble fireplaces, herringbone floors, decorative tilework) are irreplaceable. Landmark designation governs exterior and some interior work.
Ritz Carlton Residences (Emery Roth, 1930; condominium, 11 units, $10–50M). Eleven individually designed residences in the former St. Moritz Hotel. Design implication: Every unit is different — complete design freedom within 1930 Emery Roth architectural bones. Beamed ceilings, 102 feet of Central Park frontage in some units, and up to 15-foot ceilings in the Jeffries duplex define the design condition.
78 Irving Place (1920; condominium, 7 units, $3–12M). PKSB Architects' 2015 conversion of a 1920 pre-war building on Gramercy's 'Block Beautiful.' Design implication: Seven units created from 14 combined apartments — unexpected proportions and configurations are the norm. PKSB's new infrastructure allows clean smart home integration. Smallest building in this collection; renovation is entirely individual.
New Classical: Ten Buildings
220 Central Park South (Robert A.M. Stern Architects, 2019; condominium, 35 units, $7–250M). The apex of the New Classical type. Thierry Despont interiors, Smallbone of Devizes kitchens, Lefroy Brooks polished nickel fixtures, hand-laid herringbone floors. Design implication: The developer specification approaches the quality of the finest historic buildings. Renovation deepens within an established system of extraordinary quality — or makes a complete departure with equivalent conviction.
15 Central Park West (Robert A.M. Stern Architects, 2008; condominium, 202 units, $3.5–88M). The building that redefined Manhattan luxury. Sub-Zero, Wolf, Miele; Kallista Central Park West collection (designed exclusively for this building). Design implication: After 17 years, most units have been individually gut-renovated. The brief is understanding the previous renovation and deciding what to change — not improving a developer specification.
520 Park Avenue (Robert A.M. Stern Architects, 2018; condominium, 35 units, $17–130M). The East Side sister of 15 CPW. Christopher Peacock kitchens with Wolf six-burner range, two Miele dishwashers, Sub-Zero wine refrigerator; polished nickel RAMSA custom vanities. Design implication: Full-floor simplexes at 5,400 sq ft average with 225+ feet of exterior perimeter per floor. Every unit is a different orientation problem — corner light, multiple exposures, and formal room sequences define the design canvas.
70 Vestry Street (Robert A.M. Stern Architects + Daniel Romualdez, 2018; condominium, 46 units, $8–65M). RAMSA architecture and AD100 Daniel Romualdez interiors. Bardiglio Luco marble, hand-sawn oak, Miele, Sub-Zero. Design implication: Bardiglio Luco is the building's most distinctive material — dark blue-grey Italian stone rarely specified in NYC residential. Renovation that touches kitchen or primary bath must address this material with equivalent specificity.
Four Seasons Private Residences at 30 Park Place (Robert A.M. Stern Architects, 2016; condominium, 157 units, $4–25M). RAMSA limestone supertall. Bilotta rift-cut oak kitchens, Gaggenau appliances, Colorado White marble, Chinchilla Mink primary baths. Design implication: Residences start on the 39th floor above the Woolworth Building's Gothic ornament. RAMSA custom vanities are architecturally integrated — renovation of primary bath must specifically address or replace them.
The Cortland (Robert A.M. Stern Architects + Olson Kundig, 2022; condominium, 144 units, $1.45–39.5M). RAMSA framework with Olson Kundig interiors — his first large-scale NYC project. Jack box kitchen system (building-exclusive folding island), Statuario Belgia marble, Gaggenau, hand-brushed metallic lacquer cabinets. Design implication: Olson Kundig's Jack box kitchen has a mechanical concept that must be understood before planning renovation. One million hand-laid bricks create a warm exterior register — interior materials should harmonize.
255 East 77th Street (Robert A.M. Stern Architects + Yabu Pushelberg, 2026; condominium, 62 units, $2.5–24.7M). RAMSA's Gothic limestone tower in Lenox Hill. Calacatta marble kitchens, Bianco Dolomite baths, Waterworks, Miele, Sub-Zero. Design implication: New-construction baseline means first owners will set the design standard. Penthouse with 15-foot ceilings, 39-foot great room, and stone-arched loggia is the building's most demanding design brief.
The Henry (Robert A.M. Stern Architects, 2025; condominium, 45 units, $4.5–16.95M). RAMSA and Naftali's boutique UWS limestone tower. Calacatta marble kitchens, Dolomiti marble baths, Lefroy Brooks faucets, Waterworks. Design implication: Calacatta kitchen and Dolomiti bath create differentiated marble systems within a single home — two stones, two distinct registers. First-owner renovations set comparables future buyers will reference.
18 Gramercy Park South (Robert A.M. Stern Architects, 2013; condominium, 16 units, $5–42M). Zeckendorf/RAMSA conversion of a 1927 Georgian Revival. Smallbone of Devizes kitchens, Miele, Italian marble. Residents receive a key to Gramercy Park. Design implication: The Gramercy Park key confers a social dimension that no specification can replicate. 16 full-floor residences with private elevator access — 40 feet of park frontage from living rooms. Penthouse infinity pool is architecturally integrated.
Superior Ink Condominiums (Robert A.M. Stern Architects, 2010; condominium, West Village). RAMSA new construction on a West Village site. Design implication: West Village street context creates neighborhood-integration design priority — building should connect to the street's residential scale rather than read as a standalone architectural statement.
Starchitect Contemporary: Thirteen Buildings
111 West 57th Street (SHoP Architects + Studio Sofield, 2022; condominium, 60 units, $7.75–66M). World's thinnest skyscraper. Studio Sofield interiors, Crystallo white quartzite kitchens with Gaggenau, white onyx baths, P.E. Guerin bronze hardware (country's oldest architectural hardware firm). Design implication: P.E. Guerin doorknobs are cast to mirror the building's own silhouette — an irreplaceable detail. Two collections (tower and Steinway Hall) require completely different design approaches.
One57 (Christian de Portzamparc, 2014; condominium, 92 units, $3.8–100M). Pritzker Prize architect. Thomas Juul-Hansen interiors, Smallbone of Devizes, Miele, Sub-Zero, Italian marble and onyx baths. Design implication: Defined Billionaires' Row as a market concept. Smart home infrastructure was pre-installed — full scene programming upgrade is turnkey. Park Hyatt service access means clients have hotel-standard design expectations.
432 Park Avenue (Rafael Viñoly Architects, 2015; condominium, 104 units, $17–88M). Rafael Viñoly's concrete grid tower, 10x10-foot window bays. Deborah Berke interiors, Dornbracht Tara polished chrome (specified exclusively for this building), Statuario marble book-matched baths. Design implication: Dornbracht Tara is iconic — maintain, or upgrade to Tara in brushed gold for warmer register. 10x10 window grid creates specific light quality — furniture placement relative to grid is critical.
53 West 53rd Street (Jean Nouvel + Thierry Despont, 2019; condominium, 145 units, $2.7–64.7M). Jean Nouvel's diagrid above MoMA, Thierry Despont interiors. Molteni kitchens with backlit translucent statuary marble backsplash, Dornbracht polished nickel, Verona limestone and Noir St. Laurent marble baths. MoMA benefactor membership included. Design implication: Every floor plan is unique due to tapering diagrid — no standard furniture layouts apply. Backlit marble backsplash is technically complex; renovation that changes kitchen must replicate or improve. Diagrid angled windows require custom window treatment approach.
56 Leonard Street (Herzog and de Meuron, 2017; condominium, 145 units, $2.5–35M). The Jenga Building. HdM designed everything: Absolute Black granite islands, Appalachian White Oak floors, travertine baths, custom pendant lamps by Maison Lucien Gau. Anish Kapoor lobby sculpture. Design implication: 145 unique floor plans mean no standard arrangement works. HdM's restrained palette is deliberate — renovation should work within or clearly elevate, not add decorative complexity. Exposed concrete columns are irreplaceable structural features.
100 Eleventh Avenue (Jean Nouvel, 2010; condominium, 72 units, $2–12M). Nouvel's 'Vision Machine.' 1,700 uniquely angled glass panes, white terrazzo floors, stainless steel kitchens designed by the architect. Design implication: Crescent-shaped rooms require custom furniture plans — no standard rectangular arrangements work. 1,700 uniquely angled windows create ever-changing light quality throughout the day.
520 West 28th Street (Zaha Hadid Architects, 2017; condominium, 39 units, $3.85–15.5M). Hadid's only New York City building. Building-exclusive Boffi kitchens by ZHA, electrochromic glass bathrooms, Gaggenau, Dornbracht, robotic valet parking. Design implication: Boffi kitchen is an irreplaceable building-specific design object. Electrochromic bathroom glass is rare technology — maintenance requires specialist contractors. Each unit has a custom Hadid entry sculpture.
One High Line (Bjarke Ingels Group, 2024; condominium, 236 units, $2–52M). BIG's twin travertine towers. West Tower: Gabellini Sheppard, Bulthaup Grey Larch, White Princess quartzite, Taj Mahal quartzite baths, Gaggenau. East Tower: Gilles et Boissier, Calacatta Gold, Arabescato marble baths. Faena Hotel services. Design implication: Two towers, two design systems — renovation starting point is entirely different depending on which tower. Faena Hotel services mean clients expect hospitality-grade design quality in private space.
The Residences by Peter Marino (Peter Marino, 2018; condominium, 5 units, $14–59M). Five residences, 60 materials from 4 continents. Multicolor onyx baths, Lasa Gold Veins marble kitchens, Gaggenau, hydronic floor heating throughout. Downtown record at $59M. Above Lehmann Maupin Gallery. Design implication: 60 unique materials across 5 units — every intervention requires deep knowledge of that specific unit's material world. Reinforced art walls designed for institutional-quality collection hanging.
160 Leroy Street (Herzog and de Meuron + Ian Schrager, 2017; condominium, West Village). HdM's second New York residential building, with Ian Schrager. Design implication: HdM's architectural coherence applies — indoor-outdoor pool and private gardens create unusual light and acoustic conditions in adjacent spaces.
130 William Street (Adjaye Associates, 2021; condominium, Financial District). David Adjaye's sculptural tower with arched windows and biophilic amenity gardens. Design implication: Adjaye's dark concrete and arched window vocabulary creates a moody, gallery-like ambient quality that rewards art-forward design directions.
15 Hudson Yards (Diller Scofidio + Renfro, 2019; condominium, Hudson Yards). DS+R's sculptural glass tower above The Shed cultural center. Design implication: Proximity to The Shed and Hudson Yards cultural infrastructure means culturally engaged clients — art integration and smart home infrastructure are expected.
100 Vandam Street (COOKFOX Architects, 2022; condominium, 72 units, $2–25M). COOKFOX's biophilic hybrid of an 1888 warehouse and glass tower. Poliform kitchens with Bleu de Savoie marble, Gaggenau and Miele. Three distinct collections: Historic, Tower, Penthouse. Design implication: Three collections require three entirely different design approaches. Loggia biophilic gardens create unusual filtered light conditions in adjacent rooms.
Historic Conversion: Twelve Buildings
The Woolworth Tower Residences (Cass Gilbert, 1913; condominium, 34 units, $3.5–34M). Cass Gilbert's neo-Gothic masterwork. Thierry Despont interiors, Dada/Molteni cabinetry, Dornbracht platinum fixtures, Nanz nickel hardware, Calacatta Caldia marble, ceilings to 22 feet. Design implication: Nanz nickel hardware is the most rarefied architectural hardware specification in American residential. Cass Gilbert's original arched windows with colorful terra-cotta surrounds are irreplaceable landmark elements — window treatments require exceptional care.
443 Greenwich Street (Charles C. Haight, 1882; condominium, 53 units, $4.5–22M). 1882 book bindery warehouse, CetraRuddy conversion. Christopher Peacock kitchens with 48-inch Wolf range and 2-inch thick Calacatta marble islands. Original 1882 Carolina yellow pine beams exposed in every ceiling. Underground drive-in garage. Design implication: Original Carolina yellow pine beams are irreplaceable — commercially extinct material. Underground drive-in garage transforms the arrival experience; entry sequence matters less than in doorman buildings. Celebrity client profile (Tom Brady, Justin Timberlake) means privacy infrastructure is a design priority.
The Shephard (Martin V.B. Ferdon, 1896; condominium, 38 units, $3–20M). Naftali Group/Gachot Studios conversion of an 1896 Romanesque Revival warehouse. Smallbone of Devizes kitchens with black absolute granite and white statuary marble, Miele, Lefroy Brooks, Dolomiti white stone baths. Design implication: Barrel vault ceilings are the building's irreplaceable signature — design must celebrate them. Black absolute granite countertop paired with white statuary marble is an unusual contrast worth preserving or evolving intentionally.
90 Morton Street (1912 printing house; condominium, 35 units, $3–18M). Leroy Street Studio conversion. Poliform walnut lower cabinets with blackened steel upper cabinets and ribbed glass, Gaggenau, Super White quartzite, Royal Danby Vermont marble baths. Design implication: Industrial-chic design language (blackened steel, walnut, concrete beams) should be extended or evolved, not erased. Original concrete beams are irreplaceable — engage them as architectural features.
The Abingdon (1895; condominium, 8 units, $5–33.5M). Eight West Village mansion-condos up to 9,615 sq ft. Carrara marble grand staircases, 30-foot ceilings, 12'6" main floor ceilings, reinforced art walls. Design implication: Units of 9,000+ sq ft require furniture-making at private house scale. Reinforced art walls are a primary design feature — museum-quality collection hanging is expected.
108 Leonard Street (McKim, Mead and White, 1894; condominium, Tribeca). McKim, Mead and White's 1894 landmark, cast-iron facade. Design implication: Original McKim, Mead and White architectural character — soaring ceilings, cast-iron structure — defines the design register. Landmark designation governs exterior and certain interior elements.
The Plaza Residences (Henry Janeway Hardenbergh, 1907; condominium, 181 units, $1.3–35M). Hardenbergh's 1907 French Renaissance conversion. Walnut-bordered herringbone parquet reflecting original mosaic lobby patterns, Lefroy Brooks Double P monogram fixtures, full Plaza Hotel services. Design implication: ~100 different floor plans across 181 units — every unit requires a bespoke approach. Turreted corner windows and 11–15-foot ceilings create theatrical vertical scale.
Aman New York Residences (Warren and Wetmore, 1921; condominium, 22 units, $8–60M). Warren and Wetmore's gilded Crown Building. Jean-Michel Gathy/Denniston interiors, Minotti Cucine kitchens, Gaggenau, Hansgrohe, Kenya black cabochon marble baths. Three glass-enclosed fireplaces per residence. Design implication: Aman design vocabulary (warm woods, bronze, Japanese calm) should inform all design decisions — this is an Aman residence. Kenya black cabochon marble accent is unusual — extending it creates building-specific continuity.
The Pierre Residences (Schultz and Weaver, 1930; cooperative, 70 units, $3–35M). 1930 French chateau landmark, Taj Hotels services. Interior specifications vary entirely by unit — 35+ years of individual renovation history. Design implication: Each unit requires a full architectural survey before design. Hotel origin means no standard residential floor plan was ever specified — kitchen and bathroom locations may have changed multiple times since 1988 conversion.
100 Vandam Street (1888 warehouse + COOKFOX tower, 2022; condominium, 72 units, $2–25M). COOKFOX's biophilic hybrid. Historic Collection retains original 1888 exposed wooden beams and arched windows. Design implication: See also Starchitect Contemporary — COOKFOX's biophilic architecture establishes a naturalistic design language that renovation should honor or deliberately transcend.
1 Wall Street (Ralph Walker, 1931; condominium, Financial District). Ralph Walker's Art Deco masterwork converted to residences. Design implication: Art Deco architectural vocabulary (geometric ornament, vertical emphasis, rich material surfaces) creates a specific design register — renovation should engage with Walker's formal language.
The Schumacher (Edward E. Raht, 1885; condominium, 7 units, $3–15M). 1885 Romanesque Revival building in NoHo. Penthouse with two wraparound terraces, 67-foot gallery, glass-enclosed living room. Design implication: 7 units — entirely individual renovation, no building standard. Penthouse 67-foot gallery is an extraordinary linear space; furniture placement and art hanging are the primary design problems.
Luxury Contemporary: Nine Buildings
Central Park Tower (Adrian Smith + Gordon Gill + Rottet Studio, 2021; condominium, 179 units, $7.5–150M). World's tallest residential building at 1,550 feet. Rottet Studio interiors, Smallbone of Devizes, Miele, Calacatta marble. Design implication: Acoustic management, vibration awareness, and glass quality are critical at this height. Sky House penthouse at 11,535 sq ft requires furniture-making at hotel scale. Central Park Club context means clients expect hospitality-grade private space.
35 Hudson Yards (SOM/David Childs + Tony Ingrao, 2019; condominium, 143 units, $4–32M). Bavarian limestone supertall. Smallbone of Devizes, Gaggenau, Iceberg Quartzite baths, wide-plank French oak. Equinox Hotel services. Design implication: Iceberg Quartzite is the building's primary material signature — Norwegian stone with extraordinary visual drama. Equinox access means clients have professional fitness expectations for private space.
The Giorgio Armani Residences (COOKFOX + Giorgio Armani, 2024; condominium, 10 units, $7.5–32.5M). Parquet de Versailles white oak, Molteni kitchen by Armani, Gaggenau, Rosa Aurora primary baths. Design implication: Armani brand identity means clients align with warm minimalism — renovation should not fight this. 10-unit intimacy means renovation is visible to all building residents.
Madison House (2021; condominium, NoMad). NoMad's premier luxury condominium. Design implication: NoMad location at the intersection of Midtown South, Flatiron, and Chelsea creates a cosmopolitan client profile — design should reflect the neighborhood's cultural range.
The Madison Square Park Tower (KPF + Martin Brudnizki, 2017; condominium, 83 units, $1.5–18M). KPF's cantilevered fluted glass tower. Martin Brudnizki interiors, Molteni with Mercury Black marble gantry kitchen, Waterworks, White Mountain Danby marble baths. Three finish palettes. Design implication: Mercury Black marble countertop with glass ceiling-hung gantry is architecturally distinctive — renovation must address this building-specific element. Tower grows wider as it rises — upper floor units have more volume.
40 Bleecker (Rawlings Architects + Ryan Korban, 2019; condominium, 61 units, $2–10M). Korban's residential debut. Listone Giordano chevron French oak from recycled wine barrels (building exclusive), Italian cerused oak cabinetry with fluted bronze glass, honed statuary marble, Miele, Lefroy Brooks Kafka collection. Design implication: Wine barrel French oak floors are building-exclusive — renovation should honor this unusual specification. Fashion-forward cultural context means clients have strong visual preferences requiring conversant design language.
601 Washington Street (2019; condominium, 10 units, $4–35M). Ten residences on a cobblestone West Village street. SieMatic cabinetry, Gaggenau, Ariston marble. Penthouse triplex with private hot tub, plunge pool, outdoor kitchen. Design implication: 10-unit intimacy — discretion and quality are non-negotiable. West Village cobblestone street context means clients value neighborhood integration over display.
50 West Street (Helmut Jahn + Thomas Juul-Hansen, 2016; condominium, 191 units, $2.5–20M). Helmut Jahn's curved glass tower. Thomas Juul-Hansen interiors, stained walnut kitchens, Miele and Sub-Zero, Hansgrohe, floating backlit marble vanities, Toto bidet toilets. 64th-floor harbor observatory. Design implication: 500 curved glass panels create unusual light patterns. Floating backlit marble vanity is an architectural element — renovation must engage the lighting system, not just the stone.
111 Murray Street (Kohn Pedersen Fox + David Mann, 2018; condominium, 157 units, Tribeca). KPF architecture, David Mann interiors, floor-to-ceiling windows, marble baths, 75-foot pool, private garden. Design implication: Edmund Hollander's landscaped gardens distinguish the project — outdoor space integration between private residence and building gardens is a design opportunity unique to this building.
Era as Context Within the Taxonomy
The five design registers cut across construction era, but era is meaningful context within each register. The seven Victorian-era buildings in this collection (The Dakota, The Shephard, 443 Greenwich, The Abingdon, 100 Vandam, 108 Leonard, The Schumacher) share material conditions — wide-plank pine or oak, masonry construction, original tile work — that are fundamentally different from the six Edwardian/Beaux-Arts buildings (998 Fifth, The Apthorp, 90 Morton, The Woolworth Tower, The Plaza, Aman New York) or the six Interwar/Art Deco buildings (834 Fifth, The Pierre, Ritz Carlton, 1 Wall Street, 78 Irving Place, 18 Gramercy Park South). Within the Historic Conversion register, a Victorian warehouse and an Interwar Art Deco skyscraper create different material opportunities and different Landmarks obligations.
The twenty-four Ultra-Contemporary buildings (2015–present) represent the largest single era cluster in the collection. They share new mechanical infrastructure, strong developer baselines, and first-owner renovation dynamics — but diverge dramatically in design register. 220 Central Park South (New Classical), 56 Leonard Street (Starchitect Contemporary), 443 Greenwich Street (Historic Conversion), and 40 Bleecker (Luxury Contemporary) are all Ultra-Contemporary buildings with entirely different design conditions.
Reading the Taxonomy
This classification system is a tool, not a verdict. Buildings at the boundaries of categories — 100 Vandam Street (both Historic Conversion and biophilic Starchitect Contemporary), The Cortland (New Classical framework with Starchitect Contemporary-grade interior design), The Woolworth Tower (Historic Conversion with Starchitect-quality design execution) — are more interesting for the tension between their registers than for their assignment to any single one. The taxonomy's value is in the questions it enables: What does this building's type demand? What does it offer? What are the renovation constraints and opportunities specific to its architectural character? Where those questions have clear answers, the taxonomy is doing its job.