323 West 100th Street
323 West 100th Street, New York, NY 10025
BBL 1018890009 · BIN 1057129
- Year built
- 1901
- Type
- Condominium
- Landmark
- In a historic district
323 West 100th Street is a five-story, 20-foot-wide limestone-and-brick apartment house from 1901, a short block from Riverside Park. The sponsor bought it vacant for $3,425,000 in October 2025, took out a Department of Buildings permit to cut nine apartments to five, and in July 2026 filed a $7,532,476 condominium plan with the Attorney General.
That is an average of about $1.5 million a home and about $1,085 per square foot across the building's 6,942 square feet. For the Upper West Side between West End Avenue and Riverside Drive, that is a low entry price for a condominium in a landmark district. The trade-offs are a walk-up building and a small, five-owner condominium.
Architecture and residences
City records give a 20-by-100-foot lot and 6,942 square feet on five floors. Marketing of the whole building in 2024 described a limestone and brick facade and delivery vacant. The building is in the Riverside–West End Historic District Extension II, so exterior work is subject to Landmarks Preservation Commission review.
The Department of Buildings job, filed in December 2025 and fully permitted, describes general interior demolition and renovation of an existing walk-up residential building on the first through fifth floors, with apartments combined on floors two through five, reducing the count from nine to five. Separate permits cover structural, plumbing and mechanical work. A post-approval amendment filed in September 2026 was in objections in October 2026.
That works out to roughly one home per floor of about 1,300 to 1,400 square feet gross. The layouts, finishes and any outdoor space will be set out in Schedule A once the plan is accepted.
Offering and pricing
Per the offering plan filed with the New York State Attorney General (plan CD260251), the sponsor, 323 West 100th Street, LLC, submitted the plan on July 15, 2026 as a rehabilitation of a vacant building. It covers five residential units at a total offering price of $7,532,476. The record shows no amendments, no acceptance date and no units sold.
$7,532,476 across five homes averages $1,506,495. The sponsor's October 2025 purchase price of $3,425,000 compares with a $4,850,000 ask for the whole building in 2024; ACRIS also records $4,000,000 in mortgages taken out at the purchase.
No asking prices for individual homes have been published, and the building is still a single tax lot.
Local Law 97
This building is below the 25,000 sq ft threshold at which LL97 limits apply to a building on its own. It is still covered if it shares a tax lot or condominium board with buildings totaling over 50,000 sq ft; confirm on DOB’s covered-buildings list.
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Buying here? Condo closing costs with a mortgage typically run 3 to 6% of the price. See NYC co-op and condo closing costs, line by line.
What to know if you’re buying
Before the plan is accepted. The Attorney General must accept an offering plan before a sponsor can sign purchase contracts and take deposits. Before acceptance a sponsor may collect expressions of interest, but may not take reservations or deposits. Prices and unit counts can move through amendments.
A walk-up. The Department of Buildings filing describes a walk-up building, and we found no elevator filing. Price the upper floors with that in mind and ask the sponsor directly.
Historic district. Windows, the facade and any rooftop work need Landmarks Preservation Commission approval, now and after the sponsor leaves.
Closing costs. In sponsor sales the buyer customarily pays the New York State transfer tax (0.4%, or 0.65% at $3 million or more) and the New York City real property transfer tax (1% at $500,000 or less and 1.425% above for a residential unit), plus the state "mansion tax" of 1% at $1 million, rising in tiers to 3.9% at $25 million in New York City. On a $1.5 million home that is about $27,375 in transfer taxes before any gross-up and $15,000 in mansion tax.
A five-unit condominium. With five owners, each vote and each assessment carries weight, and there will be no staff. Ask how the budget covers the roof, the facade and the boiler or heating system.
Closing on a temporary certificate of occupancy. The renovation requires a new certificate of occupancy. A sponsor can close while the building holds a temporary one; ask what the sponsor holds back until the final one issues.
Comparable buildings
If you're considering 323 West 100th Street, also look at these Upper West Side condominiums:
- 314 West 100th Street — 32-apartment prewar condominium across the street
- 318 West 100th Street — 32-apartment prewar condominium across the street
- 324 West 108th Street — landmarked rowhouse converted to 10 condominium units
- 270 Riverside Drive — 2016 condominium conversion of a prewar rental nearby on Riverside Drive
- 845 West End Avenue — 2010 condominium conversion on the same block
- 817 West End Avenue — 2007 condominium conversion across West 100th Street
More Upper West Side buildings
- 321 West 78th Street — 1925 co-op
- 321 West 90th Street — 1929 co-op by Margon & Holder
- 322 West 72nd Street — 1924 co-op by George and Edward Blum
- 323 West 83rd Street — 1897 co-op
- 323 West 86th Street — 1926 co-op by Rosario Candela
- 324 West 108th Street — 1898 condominium
The neighborhood
For the full corridor — architecture, transit, and pricing across Upper West Side — read The Roebling Team Guide to Upper West Side.
How to read the facts on this page. Items attributed to an offering plan describe the building as it was offered at that filing — unit mix, square footage, the amenity program as planned. They are not a statement about how the building operates today. Tax and compliance figures are sourced separately to current City records and carry their own dates. House rules, staffing and fee policy can change by board resolution without any public filing: treat every policy line here as a starting point for diligence and confirm it with the managing agent. Where this page compares one building or neighborhood to another, that is our analysis of the recorded record — it names the measure, the period and the sample it rests on, and it is an observation about medians rather than a prediction about any particular apartment.
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646.939.7375 · c.cohen@compass.com