The Dean Boerum Condominium (40 Dean Street)

The three buildings share one condominium and one tax-lot series but read as separate addresses. 40 Dean Street and 123 Boerum Place each hold eight apartments (G1, G2, 2A–2C, 3A–3C). 125 Boerum Place holds five (G1, 2A, 2B, 3A, 3B). Apartment sizes on the Department of Finance roll run from under 600 square feet to over 2,600 square feet. The largest are the garden-level G units, at roughly 1,300 to 2,600 square feet, which points to multi-level layouts. PLUTO's four floors against three apartment designations is consistent with that, but the public record doesn't break it out. Confirm layout and any private outdoor space unit by unit.

The ten garage lots and one storage lot are separate condominium units with their own deeds and tax bills. Several are held by owners who also own apartments in the building, and a few by small holding entities. One garage space for roughly every two apartments makes deeded parking a scarce resale feature here.

The condominium is professionally managed. No offering plan, budget or financial statement for the building is on file in The Roebling Research Library, a limitation of the research files rather than proof that the documents are unavailable elsewhere. Request the plan and amendments from the seller, sponsor or applicable state records, and obtain current finances and capital information from management. The building's Department of Buildings history is light — a 2019 interior renovation filing at 123 Boerum Place is the most recent job. Ask for the façade inspection status and the garage's maintenance history as part of diligence.

A records note: the Department of Finance still lists the sponsor entity as owner of one residential lot (Unit 2B at 125 Boerum Place). ACRIS shows that unit deeded out by the sponsor and resold to a private buyer in 2005. We found no remaining sponsor inventory.

Recent sales

Recent closings at this building, from The Roebling Research Library. 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.

Market read. $/sf is measured on the latest sales with reliable square footage (2021): a median $1,200/sf (recorded) across 1 sale. The building has traded as recently as 2025. Median listing discount 1.2% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.

Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00193-7501; each condominium apartment is its own tax lot). Apartment-level facts (line, condition, asking-price context) curated and cross-verified in The Roebling Research Library. 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.

Underwrite full taxes. The 421-a benefit has expired on every lot. Pull the current bill for the specific unit.

Treat the garage space as its own asset. A deeded garage unit carries its own deed, tax lot and common charge. Confirm whether one is included, and if not, whether any are available.

Get the documents early. The research library did not hold the plan or financial statements; this does not establish their public availability. Obtain the plan through the seller, sponsor or applicable state records, and request the by-laws, the current budget, the last two years of audited statements and the house rules before contract. They settle pets, leasing, any right of first refusal and the building's capital position.

If you're considering The Dean Boerum Condominium, also evaluate:

• 120 Boerum Place — the 56-unit loft conversion with 15 garage units directly across Boerum Place; the same block, a different product
• 88 Wyckoff Street (Wyckoff House) — 42-unit 1986 conversion two blocks southeast at Smith and Wyckoff
• 457 Atlantic Avenue — 21-residence ground-up condominium from 2004 in Boerum Hill; matching unit count
• 556 State Street (Boerum Heights) — 71-unit new construction from 2006; the larger Boerum Hill condominium of the same era
• 118 Union Street — 32-residence low-rise condominium from 1990 with commercial space; the earlier low-rise precedent
• 1 Tiffany Place — 70-unit factory conversion with 14 parking units; condominium ownership with deeded parking
• 529 Court Street (The Terraces at Court Street) — 2000s ground-up condominium with parking and an expired 421-a in southern Carroll Gardens