99 Clinton Street (Spencer Mews)

The lot runs 132 feet along one frontage and 75 along the other, with the building covering roughly 114 by 69 feet — a footprint several times the size of the 22- and 25-foot row-house lots that make up the rest of the district's co-op stock. The three-story count is a tax classification, not a description: the apartments were cut from the nave and its galleries, and published accounts of individual residences here describe ceilings in the twenty-foot-plus range, original stained glass, skylights, working fireplaces, private terraces and multi-level layouts running to roughly 2,500 square feet across three levels.

A church conversion can have varied layouts; do not assume either uniform lines or that no useful in-building comparisons exist. One apartment may occupy a former gallery with clerestory glazing, another the old chancel end with a terrace cut into the roof, another a comparatively conventional flat. Square footage, ceiling height, glazing and outdoor space vary unit to unit and should be considered when evaluating the relevance of building averages. The diligence that matters is a floor plan, a measured survey, and a careful look at where each unit's windows actually face on a corner site bounded by a landmarked office building.

The envelope carries the maintenance profile of brownstone plus that of a nineteenth-century church roof — a long-span structure whose conversion work, loading and insulation require review of approved plans and current engineering reports — plus stained glass, a specialist restoration item whose costs depend on actual scope and condition. LPC permit requirements depend on the work, including proposed glazing changes; routine maintenance and in-kind repairs may be exempt. Confirm the scope with LPC and separately review DOB and cooperative requirements.

Spencer Mews Owners, Inc. holds the property per Department of Finance records. The Roebling Research Library does not hold this building's offering plan, and this page does not assert conversion terms, share allocations, staffing or house rules we have not read. Ten apartments within roughly 19,400 gross square feet does not establish comparative operating costs or measured interior areas; review the actual budget, condition and capital plan. How that burden divides among shareholders depends on the share allocations in the offering plan.

The diligence list follows. Request the audited financial statements and current budget, the reserve balance and assessment history, the underlying mortgage terms, the FISP/Local Law 11 cycle and roof history, the condition and maintenance record of the stained glass, and the current house rules and purchase application. In a corporation this small a single capital event falls on ten apartments, divided by their share allocations, and the reserve position matters more than it would in a fifty-unit building.

Recent sales

Recent transfers 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. Most recent trades (2026 to date) cleared a median $1,264/sf (recorded) across 1 sale. Median listing discount 1.4% 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 3-00255-0025). 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 on co-ops is not officially recorded, figures shown are approximate.

Diligence the corporation, not just the apartment. The offering plan is not in general circulation. Get the plan, house rules, purchase application and financials in writing before contract, and do not assume standard prewar terms.

Ten apartments carry a church. Roof, stained glass, masonry and heating in a long-span nineteenth-century structure, shared across the apartments in proportion to the shares set in the offering plan. Reserve balance and assessment history come first.

Compare actual plans. Measure the apartment, check lawful room counts and map exposures against the neighboring office building. Assess whether other apartments offer useful comparisons after accounting for area, volume, glazing and outdoor space.

Confirm the permit scope for glass and envelope work. Proposed window or stained-glass changes may require LPC permits; routine maintenance and in-kind repairs may be exempt. Confirm the actual scope and separate DOB and cooperative requirements.

Sell the history, because it is genuinely rare. An 1850 Gothic Revival church — one of 47 Gothic Revival buildings, of every use, that the Brooklyn Heights Association counted in the district when it was designated in 1965 — converted in 1978–79, among the first church-to-residence conversions in New York City.

Describe volume and lawful rooms accurately. Document measured floor area, ceiling heights and surviving glazing alongside the approved bedroom count; these features do not establish that no comparable cooperative offers them.

Name the block's oddity. The only Brooklyn Heights Historic District building on a block of Borough Hall Skyscraper District towers — a documented preservation context whose review process permits approved changes.

Assemble documents in advance. Buyers' attorneys will ask more questions here. Having the plan, financials and rules ready before the first offer shortens the deal materially.

If you're considering 99 Clinton Street, also evaluate:

• 8 Old Fulton Street (Brooklyn City Railroad Company Building) — an eleven-unit cooperative inside a landmarked nineteenth-century non-residential building; the closest structural analogue in the Heights
• 1 Main Street (The Clock Tower) — the borough's headline adaptive reuse and the reference point for volume-driven pricing
• 30 Main Street (The Sweeney Building) — industrial conversion with the ceiling heights and irregular plates that behave like this building's
• 37 Bridge Street (Kirkman Lofts) — boutique loft conversion drawing a comparable buyer pool
• 130 Clinton Street — the corridor's larger prewar cooperative, for services against singularity
• 40 Clinton Street — Clinton Street co-op peer closer to Montague
• 138 Remsen Street — converted brownstone co-op nearby on Remsen Street; the conventional alternative at similar unit count
• 100 Remsen Street — postwar apartment-house co-op nearby, for a full-service comparison