115 Willow Street

The 39 units distribute across six floors around a single elevator core, in configurations from one-bedrooms — many descending from the original four-room suites — through combinations assembled over the decades. Period fabric is the pricing axis: high ceilings, wood floors, picture rails, and the Gothic fenestration read strongest in units that have been renovated with rather than against them. Willow-facing units take the row-house streetscape and western light toward the Promenade blocks; rear units face the garden side and the interior of the block shared with the Hicks Street co-ops, and are the building's quietest tier.

Construction is 1920s masonry with fire escapes, and the LPC layer applies to windows and any façade-adjacent work — routine in the district, but a step renovating buyers should schedule for. Alterations run through the managing agent's alteration agreement with board approval; contractor hours are weekday-limited under the house rules.

115 Willow runs as a serviced small cooperative under 115 Willow Street Corporation: evening doorman coverage, a live-in superintendent, central laundry, and the shared garden, with professional management administering access, alteration, and sale procedures. The house rules — adopted in their current form in 2010 — are practical rather than punitive: a 70 percent carpet rule, quiet hours from 11 p.m. to 8 a.m., garden hours of 10 a.m. to 10 p.m., board-approved and revocable pet privileges, and notification requirements for sales and open houses. Smoking is prohibited in all interior and exterior common spaces.

The offering plan and first amendment, house rules, and a multi-year run of the corporation's financial statements are maintained in The Roebling Research Library and shared with clients during diligence.

Purchase approval: Board approval required (standard cooperative); sale listings and open houses require notice to the superintendent and board under the house rules.

Pets: Domesticated pets only, subject to board approval; privileges are revocable on written notice — a documented rule, so factor it into any pet-dependent purchase.

Subletting: Governed by the proprietary lease with board oversight; the house rules bind subtenants and roommates. Confirm the current sublet policy and any term limits before structuring an investment-minded offer.

Financing: A 25 percent minimum down payment has been reported in recent coverage; confirm the board's current posture directly.

Carpet: 70 percent coverage outside kitchens, baths, and closets.

Renovations: Written application and managing-agent alteration agreement with board approval; weekday contractor hours, with quiet Saturday work only by advance approval.

Flip tax and washer/dryer policy: Not documented in the materials reviewed; confirm at offer stage.

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. $/sf is measured on the latest sales with reliable square footage (2025): a median $1,800/sf (recorded) across 1 sale. The building has traded as recently as 2026. Median listing discount 0.0% from the last ask.

Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00235-0028). 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.

The block is the asset; the building is the value route in. Willow between Clark and Pierrepont is row-house Brooklyn Heights at its most intact, and this is one of the few ways to own on it at apartment pricing. Judge value against the block's scarcity, not just the unit's square footage.

Buy the period fabric where it survives. Gothic windows, high ceilings, and picture rails are the building's character. Compare recent sales of units that keep them with renovated units of similar size, floor and exposure; retained period detail can affect buyer interest, but it does not guarantee a premium or protect against a loss on resale.

Take the documented rules seriously. Pet approval is board-granted and revocable, carpet coverage is enforced, and financing has been reported at 25 percent minimum down. None of it is unusual for the district; all of it belongs in your offer planning.

Know the conversion history. The co-op was created by its own residents. Submit a complete, well-prepared board package, and review the current budget, audited statements, debt and any assessments.

Tell the conversion story. A building its tenants organized to buy in 1983 has a documented provenance; it belongs in the narrative alongside the architecture.

Photograph the Gothic. Window surrounds, parapet, and chimneys distinguish this building from every generic prewar comparable; exterior and detail photography earn their space in the marketing file.

Anchor per-room pricing to configuration and condition. The spread between period-intact, renovated, and combined units is the real pricing axis; the building's own line history — not neighborhood averages — makes the case.

Flag the process practicalities early. Superintendent and board notice before listing and showings is a house rule; building it into the marketing timeline avoids friction with the neighbors who will vote on your buyer.

If you're considering 115 Willow Street, also evaluate:

• 128 Willow Street — prewar co-op neighbor across the street
• 149 Willow Street — small co-op peer farther south on Willow
• 135 Willow Street — the postwar services alternative with garage on the same street
• The Mansion House (145 Hicks Street) — the nearby 1935 doorman co-op; the services step-up
• 130 Hicks Street — the postwar entry-tier co-op back-to-back on the same block interior
• 70 Clark Street — prewar elevator co-op by the Clark Street station
• 72 Orange Street — 1937 prewar co-op on the fruit streets; the sibling character play two blocks north
• 160 Columbia Heights — the Promenade-adjacent co-op tier for buyers stepping up
• 2 Grace Court — larger prewar co-op in the district's southern blocks