- Year built
- 1881
- Type
- Condominium
- Units
- 13
- Floors
- 9
- Landmark
- No
- Pets
- Not documented in the offering plan on file or in public records — confirm the house rules with the managing agent
Every recorded sale at this building, 2017–2026
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf
- $2,238
- Listing discount
- 4.4%
- Recorded sales
- 19
- On record
- 2017–2026
The building at the corner of Franklin Street and Broadway was put up in 1881 and 1882 to designs by W. Wheeler Smith, and the Landmarks Preservation Commission designated it an individual landmark on July 27, 1982 — ten years before the Tribeca East Historic District was drawn around it. Individual designation is the stricter instrument. It covers the whole building rather than a streetscape, and it is the reason the conversion of this particular loft took more than a decade to complete.
What the conversion did is unusual. Shigeru Ban Architects America, working with Dean Maltz Architect as architect of record, kept the cast-iron and masonry elevations and added three levels above them, taking the building from six stories and 94 feet to nine stories and 116 feet in the Department of Buildings record. The addition is glass and steel and reads as a separate object sitting on the historic mass rather than as an extension of it. LPC approved it under a Certificate of Appropriateness and then processed amendments to that approval across three separate filings between 2002 and 2012 — a long negotiation that is legible in the docket.
Inside, the plan is thirteen residences over one commercial unit. The unit numbering — 2A through 2D, 4A through 4D, 6A through 6C, then PHA and PHB — is the clearest description of the layout: the residences occupy two floors each, and the certificate of occupancy records them as duplexes with lower and upper levels. Interior areas in the offering plan's Schedule A run from roughly 2,000 square feet to roughly 4,570, three to five bedrooms. For a 55,000-square-foot building that is a very low unit density, and it is the reason the amenity program — fitness with a dance and yoga room, a playroom, a lounge, a steam room and sauna, a courtyard — is carried by only thirteen residential common-interest payers.
Two structural facts sit underneath the aesthetics and are more likely to matter to a buyer than the elevation is.
The first is that the building's unused development rights are gone. PLUTO shows the lot built to a 6.37 floor-area ratio against a 10.0 residential maximum, which on paper suggests roughly 31,000 square feet of unused capacity. It is not available. The offering plan on file discloses that the airspace beginning 55 feet above the roof, together with the development rights, is owned by a separate entity under a zoning lot development agreement dated 2002 and is excluded from the condominium property. The Department of Buildings recorded a subdivision creating that air-rights parcel in 2013, and LPC docketed a transfer-of-development-rights application for the lot in August 2025, issued that December. The practical consequence is that the building cannot expand vertically and that a neighboring site may be able to use rights that originated here.
The second is the certificate of occupancy. The conversion job has never received a permanent certificate. It has run on temporary certificates since the first ones were issued in 2013, and the most recent renewal in the Department of Buildings record was issued in August 2026, thirteen dwelling units, still temporary. The offering plan anticipated this: the sponsor posted a $150,000 escrow against the cost of obtaining a permanent certificate, on an architect's opinion that one should follow within about fifteen months of September 2017. Nine years later the building is still renewing. This is not unusual for a landmarked conversion of this complexity, and it does not prevent occupancy, financing or resale in practice — but it is a real diligence item, and any buyer should ask for the current certificate and the outstanding-requirements list before contract.
Architecture and unit composition
The historic building is a corner store-and-loft of the type Broadway was built out with in the 1880s: cast-iron and masonry elevations on both the Broadway and Franklin Street faces, ordered vertically and articulated in a Classical Revival vocabulary, with a heavy cornice at the sixth floor. LPC's record describes the original building type as "store and lofts," which is what it was — retail at the base, manufacturing and warehousing above.
The addition sits above that cornice. Where the historic building is opaque and rhythmic, the new levels are glazed, and the penthouses take their light and their outdoor space from that change. The two conditions are legible from the street as separate periods, which is the argument the Certificate of Appropriateness turned on.
Residences occupy two floors each and are entered directly from the elevator through a lock-off, so there are no public corridors on the residential floors. The offering plan records the lot-line windows: the south wall carries them on the seventh, eighth and ninth floors, which means those specific openings depend on the adjacent property remaining unbuilt at that height and can be lost without recourse. A buyer on the upper floors should establish which windows in the specific residence are lot-line windows and what the neighboring site can support.
Two further conditions from the plan are worth knowing. The storage lockers assigned to each residence sit in sub-cellar vault space owned by the City of New York, which retains the right to repossess it. And a New York City subway tunnel runs beneath the adjacent street, which is a normal downtown condition and a normal thing to test on a walk-through at rush hour.
Building operations
The building runs as a full-service condominium at very small scale. The offering plan's budget provides a doorman and concierge covering the lobby around the clock and a non-resident superintendent, non-union, with a porter function folded into the superintendent's hours. Two passenger elevators serve the residences with direct, keyed access.
The amenity program is generous relative to the building and expensive relative to the denominator. Thirteen residences carry a fitness center with a dance and yoga room, a children's playroom, a lounge, a water room with steam and sauna, an outdoor courtyard, bicycle storage and a common laundry room. Common charges should be read per square foot against the specific residence and against the current operating budget rather than against the amenity list.
The offering plan established no capital reserve fund at the outset — a common structure in a conversion of this vintage, and one that puts the burden on the board's later funding decisions. A buyer should ask for the most recent audited financial statement, the current reserve position, any live or contemplated assessment, and the status of the building's Local Law 11 façade cycle, which on a landmarked cast-iron elevation is a materially more expensive undertaking than on a masonry one.
Policy framework
Ownership form: Condominium. There is no board approval of purchasers. The offering plan on file grants the Condominium Board a right of first refusal to purchase or lease a unit, which produces a shorter and more predictable closing timeline than a cooperative approval process.
Working capital contribution: Two months' common charges, non-refundable, payable by every purchaser — including on resale. This functions economically like a transfer fee and is frequently missed in buyer closing-cost estimates for this building.
Flip tax: None appears in the offering plan on file. Confirm with the managing agent whether the board has since adopted a resale contribution.
Subletting: Permitted under the condominium framework, subject to the board's right of first refusal to lease. Minimum lease terms should be confirmed in the current house rules.
Pets and pied-à-terre: Not documented in the offering plan on file or in public records. Confirm both with the managing agent before contract.
In-unit washer/dryer: Yes, in every residence.
Real estate taxes: No exemption of any kind on any unit lot in the FY2021 through FY2027 Department of Finance records. Underwrite full unabated taxes on the specific unit and run True Monthly Carrying Cost analysis against the current bill.
Local Law 97
- 2024–2029 annual penalty
- $0 (under cap)
- 2030–2034 annual penalty
- $10,660/yr
- Per unit / month range
- $0 – $68
Source: NYC LL84 benchmarking and PLUTO · The Roebling Research Library. City record last verified September 2026.
See full Local Law 97 analysis — emissions history, scenarios, methodology →Facade safety — Local Law 11
The latest available filing classified the facade as SWARMP — Safe With A Repair and Maintenance Program: the engineer identified conditions requiring monitoring or repair before the next inspection cycle. The scope, timeline, and how the building funds the work are building-specific — we review the filings and board materials for you.
How to read this, and where it comes from
QEWI = Qualified Exterior Wall Inspector — the licensed engineer the city requires to sign the report (the independent expert, not the managing agent).
Source: NYC DOB facade filings (FISP) · The Roebling Research Library. City record last verified September 2026.
Recent sales
Cast Iron House launched sales under a plan filed in March 2014 and recorded its first closing in November 2017. Sellout ran slowly: the sponsor had sold two residences as of the end of 2017, and recorded deeds show the remaining units closing individually across 2018, 2019, 2021, 2022 and 2025, with the first resales beginning in 2020. The commercial unit at the base remains in the sponsor entity's name in the FY2027 assessment roll and was leased to a bank branch on a long-term lease under the offering plan.
The pricing frame is duplex loft space in a landmarked Tribeca building with a contemporary architectural signature, and the right comparable set is the small group of Tribeca conversions with named architects and low unit counts rather than the larger full-service Tribeca condominiums west of Hudson Street. Two features separate this building from most of that set: the absence of any tax abatement, which raises the true monthly relative to the headline price, and the two-months-of-common-charges working capital contribution due on resale. Both belong in the underwriting before an offer, not after. Unit-level transaction history is maintained in The Roebling Research Library and shared with clients during diligence.
Recent closings at this building, curated by The Roebling Team research desk. Prices are the transfer amounts recorded with the NYC Department of Finance; apartment-level detail is checked against the building’s own file in The Roebling Research Library before publishing.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Jan 20, 2026 | 4B | 3 BR · 3 BA · 2,861 sf | $5,700,000 | $1,992/sf | -4.9% |
| Feb 6, 2025 | PHA | 4 BR · 3.5 BA · 3,809 sf | $11,000,000 | $2,888/sf | -8.3% |
| Apr 28, 2022 | PHB | 4,568 sf | $14,250,000 | $3,120/sf | off-mkt |
| Apr 7, 2022 | 7A | 4 BR · 4 BA · 4,250 sf | $8,400,000 | $1,976/sf | -4.0% |
| Apr 6, 2022 | 6A | 5 BR · 4 BA · 4,250 sf | $8,400,000 | $1,976/sf | off-mkt |
| Jan 22, 2021 | 4A | 4 BR · 3 BA · 3,197 sf | $5,625,000 | $1,759/sf | -20.8% |
| Jun 27, 2019 | 2 | 3 BR · 3 BA · 2,859 sf | $4,300,000 | $1,504/sf | -10.9% |
| Jun 24, 2019 | 2D | 4 BR · 3 BA · 3,772 sf | $5,575,000 | $1,478/sf | -4.7% |
Market read. Most recent trades (2026) cleared a median $2,238/sf across 1 sale. Median listing discount 4.4% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Full closing history with price-per-square-foot over time, the complete retrade record, and every line that has traded.
Sales sourced from NYC Department of Finance recorded transfers (BBL 1-00174-7505) and verified listing data. Apartment-level facts (line, condition, asking-price context) curated and cross-verified by The Roebling Team research desk. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price; square footage from recorded condo declarations and offering plans.
What to know if you’re buying
Ask for the current certificate of occupancy. The building operates on renewing temporary certificates and has since 2013. Get the current one and the outstanding-requirements list, and understand what remains before a permanent certificate can issue.
Correct the year built. PLUTO says 1915. LPC's record for the tax lot says 1881–1882. Any analysis or automated valuation keyed to the PLUTO vintage is working from a wrong number.
Do not underwrite the unused FAR. The gap between the built 6.37 and the 10.0 residential maximum is not available to the condominium. The airspace above 55 feet and the development rights are held separately under a 2002 zoning lot development agreement.
Budget the working capital contribution. Two months' common charges, non-refundable, on a resale purchase.
Establish the lot-line windows. The south wall carries them on floors seven through nine. Find out which openings in the specific residence depend on the neighbor.
Landmark process is part of ownership here. Individual designation means exterior work — windows, storefront, façade, mechanical louvers — goes through LPC. Ask what the building's next façade cycle looks like and what has already been approved.
What to know if you’re selling
The architectural provenance is the durable argument. A Pritzker laureate's only residential conversion of a cast-iron Broadway landmark is not a claim another Tribeca building can make.
Be direct about the tax posture. There is no abatement and never was one. Presenting the unabated number up front, paired with True Monthly Carrying Cost analysis, produces better outcomes than letting a buyer's counsel surface it in diligence.
Prepare the certificate-of-occupancy answer in advance. Sophisticated downtown buyers' counsel will find the temporary certificate immediately. Have the current one, the renewal history and the outstanding-requirements list ready.
Price line by line. Thirteen residences across four unit lines and two penthouses means a building average is close to meaningless. Floor, line, outdoor space and exposure drive the number.
Comparable buildings
If you're considering Cast Iron House, also evaluate:
- 371 Broadway (Franklin Place) — the nearest peer by address and by conversion type; a Broadway loft building at the same intersection of landmark constraint and contemporary insertion
- 90 Franklin Street — small-scale Franklin Street loft condominium a block west; the same street, lower unit count, different price tier
- 155 Franklin Street — boutique Tribeca loft condominium; the low-density alternative further west
- The Sterling Mason (71 Laight Street) — Morris Adjmi Architects' paired historic-and-new Tribeca condominium; the closest analogue for an addition read as a distinct object
- 56 Leonard Street — the marquee architect-driven Tribeca condominium at full tower scale; the opposite end of the same buyer pool
- 10 Leonard Street — small Tribeca East loft condominium in the same historic-district fabric
- 350 Broadway — Broadway loft conversion directly opposite; the same corridor, a very different specification
- 374 Broadway — Broadway loft building on the same stretch; the value alternative
- 39 North Moore Street — boutique Tribeca conversion with no abatement; a close match on tax posture and unit count
- 443 Greenwich Street — the full-amenity Tribeca conversion benchmark; larger, west of Hudson, and a useful counterweight on common charges
The neighborhood
For the full corridor — architecture, schools, transit, and pricing across Tribeca — read The Roebling Team Guide to Tribeca.
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.
Considering a move at Cast Iron House. The landmark designation names the building the 361 Broadway Building, also known as the James S. White Building?
Request a private building brief with the relevant comparable sales, current and off-market availability, and an apartment-specific view of value.
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at Cast Iron House. The landmark designation names the building the 361 Broadway Building, also known as the James S. White Building would likely sell for today, what it costs to sell, and what you’d walk away with — reviewed personally against condition, exposures, renovation quality, and the competition actually on the market.