5 River Park (347 Henry Street)

The building is a fifteen-story masonry-and-glass slab with projecting balconies, on a corner parcel of roughly 20,675 square feet. The zoning arithmetic explains the massing better than the elevation does: the site permits a residential FAR of 2.43 and the building occupies 2.13, so the height is not a density story — it is a footprint story. Concentrating a modest floor-area allowance into a slender fifteen-story volume, among three- and four-story brownstones, produces a building that reads far larger than its floor area. That is exactly what the 2015 rezoning debate was about.

Apartments run from one to four bedrooms, a substantial share carrying private outdoor space by way of the balconies that define the façade. The parking is held as a separate condominium unit of eighteen spaces assessed as commercial tax class 4; the sponsor's tax counsel apportioned 95.50 percent of the property's assessment to the residential units and 4.50 percent to the parking unit.

5 River Park operates as a full-service condominium with the amenity infrastructure of a much larger building spread across only twenty-five apartments. The garden promenade, heated outdoor lap pool, bocce court, outdoor cooking areas, residents' lounge, game room, music studio, storage, bicycle room and parking are shared among a very small owner base. That is the building's principal luxury and its principal carrying-cost exposure: amenity operating expense divided by twenty-five units is a different arithmetic from the same expense divided by two hundred. Pull the current operating budget and reserve position rather than reasoning from the amenity list.

This is the most consequential thing in the building's file, and it is documented at length in the offering plan amendments.

At conversion, the sponsor's real estate tax counsel projected the residential units' taxable assessed value on the basis of 49,199 residential square feet, producing estimated first-year taxes of $513,589 for the condominium. The Department of Finance instead assessed the property using 72,604 square feet — a figure that, per counsel's opinion on file, included basement and mechanical space that should not have been assessed and valued parking area at residential rather than commercial rates. The 2020/2021 actual assessed value came in at $7,596,900 against counsel's corrected estimate of $4,535,350. Left uncorrected, that assessment would have produced first-year taxes near $984,552 — roughly 92 percent above the offering plan's projection.

The sponsor filed an application with the New York City Tax Commission and commenced an Article 7 judicial proceeding in Kings County Supreme Court challenging the assessment, with a further application filed for the 2021/2022 year. Counsel's opinion on file characterizes the assessment as the most significant valuation error encountered in thirty years of practice in the field.

The sponsor's undertaking. In the amendment on file, the sponsor agreed to pay the difference between the plan's projected taxes and the taxes actually assessed — for the first year of condominium operation and, if the proceedings remained unresolved, until they concluded — to deposit the projected 2021/2022 over-assessment with the managing agent before the first closing, and to advance litigation costs. In exchange, the sponsor reserved the right to control and settle the proceedings without board or unit-owner consent, to be reimbursed out of any refund, and to be reimbursed by purchasers for their proportionate share of costs. That undertaking was expressed to run only to purchasers who executed purchase agreements before the amendment's acceptance date — it was not a permanent building-level protection.

What this means today. Establish, through the managing agent and the building's counsel, how the proceedings were resolved, what assessed value the units now carry, whether any sponsor reimbursement or purchaser cost-sharing obligation remains outstanding, and what the current tax bill on the specific unit actually is. Do not underwrite this building from a listing's tax estimate. Pull the bill.

In 2020, before closings began, residents across several blocks of Cobble Hill and Brooklyn Heights reported a persistent high-pitched whistling emanating from the building in wind. As reported by Brooklyn Paper, an acoustic engineer retained by the developer traced the sound to the balcony railings, which stand well above the surrounding low-rise roofline and are exposed to wind off the Brooklyn waterfront. A temporary remedy — boards fastened to the balustrades — blew off within days. The city's Department of Environmental Protection planned noise readings, and local elected officials wrote to the State Attorney General and the Department of Buildings asking that the offering plan and certificate of occupancy not be signed off until the noise was resolved.

This was a pre-occupancy construction condition, and the building subsequently closed and has been occupied for years. It is included because it is well documented, because it concerned the façade rather than a cosmetic matter, and because a buyer is entitled to know what was done about it. Ask the managing agent for the remediation record on the balcony railings, whether the fix was permanent, whether it was performed at sponsor or building cost, and whether any related sponsor claim remains open.

Recent sales

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.

Market read. Most recent trades (2025) cleared a median $1,958/sf across 2 sales. Median listing discount -2.7% over ask.

Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00291-7501) 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.

Resolve the tax position first. Get the current assessed value, the current bill on the specific unit, the outcome of the Tax Commission and Article 7 proceedings, and confirmation that no purchaser cost-sharing obligation remains outstanding.

Ask for the balcony-railing remediation record. What was done, when, by whom, at whose cost, and whether it is permanent.

Ask what remains sponsor-held. The broader River Park development experienced financing pressure at the master-development level, and a portion of the Cobble Hill site changed hands in 2022. Establish how many units in this condominium remain unsold or sponsor-held, since that affects both board control and the building's collections risk.

Understand the amenity economics. Twenty-five units carrying a pool, a bocce court, a garden promenade, a game room and a music studio. Pull the operating budget and the reserve balance.

Confirm the historic-district boundary. The building is outside the Cobble Hill Historic District; its immediate neighbors are inside it. That constrains what can change next door and is a genuine amenity — but it also means the building itself carries no landmark protection.

Parking is a separate unit. If a space matters to you, confirm availability, transferability and whether it conveys with the apartment or is separately purchased.

Lead with scarcity, not with per-foot pricing. Family-sized, new-construction, full-service condominium inventory with parking and a pool does not otherwise exist in Cobble Hill. That is the argument.

Be forward about the tax history. It is documented in the plan amendments and any competent buyer's counsel will find it. Presenting the resolution proactively converts a discovered problem into a settled one.

Have the balcony remediation record ready. Same logic. It is a matter of public reporting; the answer belongs in the marketing file, not in a mid-contract email.

Position against Brooklyn Heights and the waterfront, not against Cobble Hill row houses. The buyer weighing this apartment is weighing it against new-construction condominiums, not against a brownstone floor-through.

Closing pace is condominium-fast — right of first refusal rather than board approval.

If you're considering 5 River Park, also evaluate:

• The Arches at Cobble Hill (401 Hicks Street) — 59-unit condominium conversion of a 19th-century parish complex; the closest Cobble Hill condominium alternative, in an entirely different architectural idiom
• Cobble Hill Towers (439 Hicks Street) — Alfred Tredway White's model-housing buildings; the neighborhood's most distinctive apartment stock
• One Clinton (1 Clinton Street) — new-construction Brooklyn Heights condominium tower; the nearest true peer on service model and finish level
• The Lookout Hill Condominium (199 State Street) — boutique Brooklyn Heights condominium; smaller, no amenity package
• 358 Court Street — Carroll Gardens condominium on the neighborhood's commercial spine
• Court Street Lofts (505 Court Street) — loft-format condominium alternative toward the Columbia Waterfront
• 200 Congress Street — Cobble Hill cooperative; the lower-carrying-cost alternative in the same blocks
• 301 Henry Street — Cobble Hill building on the same street, prewar scale
• 174 Pacific Street — Cobble Hill boutique building a few blocks north
• The Hendrik (509 Pacific Street) — contemporary Boerum Hill condominium with a comparable amenity ambition
• 450 Clinton Street — Cobble Hill alternative toward the Columbia Waterfront