- Year built
- 1836
- Type
- Condominium
- Units
- 23
- Floors
- 4
- Landmark
- Designated
- Pets
- Pets permitted under the condominium rules
- Subletting
- Permitted under the condominium declaration
- Pied-à-terre
- Allowed
445 West 20th Street is one of the most unusual for-sale propositions in Chelsea: a condominium carved from a Gothic Revival building first erected in 1836, on the campus of the General Theological Seminary, inside the Chelsea Historic District. The West Building — Manhattan schist, pointed-arch detailing, four stories — was among the seminary's original structures. The Brodsky Organization's 2013 project converted it to eight condominium residences and added a new annex on the site of a former seminary tennis court, joining the two with a recessed, two-story glass court. The result is a 23-residence condominium with a provenance no new-construction tower on the corridor can replicate.
The address sits on the block that defines historic Chelsea. The General Theological Seminary's interior garden — "the Close" — is one of the largest privately held green spaces in the neighborhood, and the surrounding blocks hold the Greek Revival and Italianate row houses (including Cushman Row) that anchored the Chelsea Historic District designation. Buyers here are purchasing into that architectural context as much as into the residences themselves.
This is a small, architecturally specific building. It does not compete on amenity breadth with the glass condominiums along the High Line a few blocks west; it competes on rarity, on the historic-district setting, and on interiors that were specified for a trophy buyer pool — units ranged from roughly 1,191 to 3,790 square feet at first sale, with duplexes and penthouses carrying private outdoor space.
Architecture and unit composition
The historic West Building's eight residences retain the bones of the 1836 structure — masonry walls, generous ceiling heights, and the Gothic Revival window rhythm — reworked for contemporary residential use. The 15 annex residences are new construction in brick and glass, scaled to the historic district and connected to the West Building through the glass court. Interiors throughout were designed by Alan Wanzenberg, with the finish package pitched at the high end of 2013-era Chelsea new development.
Layouts run from one-bedrooms through three-bedroom duplexes and penthouses; the larger residences carry private outdoor space, and several units draw light and views from the seminary garden. The combination of historic-district setting, garden adjacency, and low unit count is the building's core identity.
Building operations
445 West 20th Street operates as a full-service boutique condominium: full-time doorman, resident manager, fitness center, bicycle room, and private storage, with access to the seminary's landscaped block interior. Common charges and property taxes reflect a small building with a high service level and a historic structure to maintain — buyers should model the full monthly carry and review the building's reserve position and any capital-improvement history, as is prudent with any building that includes a nearly two-century-old structure.
What to know if you’re buying
The historic-district provenance is the asset. You are buying into the General Theological Seminary block and the Chelsea Historic District. That setting is permanent and unreproducible; price it accordingly.
Historic structure means diligence on building systems. The West Building dates to 1836. Review the reserve study, recent financial statements, and any capital-improvement plan during due diligence.
Condo flexibility is real. Pied-à-terre, subletting, foreign buyers, and LLC/trust ownership are permitted under the condominium declaration; closings run on condo timelines.
Mansion tax thresholds apply. At this building's pricing, the $1M, $2M, $5M and higher cliffs are routinely in play. Run pricing through the Mansion Tax Calculator.
Variable board financial policy — confirm at offer stage. Financing percentages and any sublet terms specific to your situation should be confirmed in writing before you commit.
What to know if you’re selling
Lead with the provenance. The 1836 West Building, the seminary garden, and the Chelsea Historic District setting are the story; marketing should foreground them.
Pricing requires apartment-level comps. With 23 residences and thin turnover, comparable selection is delicate — historic building versus annex, floor, exposure, and outdoor space all move the number.
The buyer pool is specific. Architecturally motivated buyers and those who want historic-district permanence are the core audience; reach matters more than volume.
Comparable buildings
If you're considering 445 West 20th Street, also evaluate:
- 245 Tenth Avenue — Della Valle Bernheimer 2010; nearby High Line boutique condominium
- The Caledonia (450 W 17th) — Handel 2008; nearby Chelsea full-service condominium
- 100 Eleventh Avenue — Jean Nouvel 2010; nearby Chelsea architectural condominium
- 519 West 23rd Street — Lindy Roy 2008; nearby boutique High Line condominium
- 252 Seventh Avenue (Chelsea Mercantile) — 2000 conversion; large-format Chelsea condominium
The Roebling Team at 445 West 20th Street
The Roebling Team at Compass works the full Chelsea and Manhattan market, including its historic-district and conversion inventory. We publish this profile because buyers and sellers of architecturally specific, low-turnover buildings deserve building-level intelligence — provenance, operational reality, and apartment-level pricing context — rather than generic market commentary.
If you're considering a purchase or sale at 445 West 20th Street, a 30-minute consultation is the right starting point. We'll bring the full context this page provides plus the transactional specifics your situation requires.
The neighborhood
For the full corridor — architecture, schools, transit, and pricing across Chelsea — read The Roebling Team Guide to Chelsea.
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