343 4th Avenue (Novo)
343 Fourth Avenue, Brooklyn, NY 11215
Park Slope, Brooklyn
BBL 3009817501 · BIN 3393449
- Year built
- 2006
- Type
- Condominium
- Units
- 113
- Floors
- 12
- Landmark
- No
- Subletting
- Permitted in the standard NYC condominium form (right of first refusal); minimum lease term and any short-term-rental prohibition not documented
- Pied-à-terre
- Permitted (standard NYC condominium)
Compiled by The Roebling Research Desk from the building’s offering plan, amendments, and related building documents. Reported and subject to confirmation. Board policies can change by amendment — confirm at the offer stage.
343 Fourth Avenue is what the Fourth Avenue rezoning produced first. On April 2, 2003 the City Planning Commission approved a 110-block Park Slope rezoning, and the City Council adopted it on April 30. The plan did two opposite things at once: it mapped contextual R6B, R7B, R6A and R7A districts across the brownstone blocks to cap them at their existing scale, and it replaced the R6 and R7A zoning on Fourth Avenue with R8A — a floor-area ratio of 6.02 and building heights up to 120 feet. City Planning's reasoning was straightforward: Fourth Avenue was 120 feet wide, sat on top of three subway lines and was lined with underused sites, so it could carry the density the rowhouse blocks could not.
Five months later, in September 2003, a new-building application went in for this lot. What got built is exactly what the new zoning allowed — twelve stories, 120 feet, 113 apartments over a commercial base and an internal garage — and it went up fast enough to be one of the first large residential buildings finished on the reimagined avenue. Contemporaneous Brooklyn real-estate reporting captured both halves of the reaction: the design drew little affection, and the apartments sold anyway, with one-bedrooms opening in the low $300,000s at a moment when nothing else in Park Slope was priced there. Two decades on, that trade — architectural modesty in exchange for price and transit — is still the honest description of what this building offers, though the price gap has narrowed considerably.
The development story belongs to the 2000s Brooklyn cycle. The owner on the Department of Buildings file is 343, LLC, with Shaya Boymelgreen named as principal — among the most prolific Brooklyn developers of that era. So is the paperwork tail: the property ran on a long sequence of temporary certificates of occupancy, and the final certificate of occupancy was not issued until March 9, 2017, roughly a decade of TCO renewals for a building substantially occupied from the late 2000s. That is resolved history rather than current risk — a final CO exists — but it is exactly the sort of file a careful buyer should see explained rather than glossed.
The tax position is the single most useful thing to know here. Department of Finance exemption records show a 25-year 421-a benefit running on the residential unit lots with benefits beginning in the 2009 tax year. That benefit is still in effect and it is the reason the monthly carrying cost at this address reads better than the sale price alone would suggest. It is also finite: the exemption steps down in its final years on the statutory schedule, and the property then sits at full assessment. The correct approach is not to guess at a single phase-out date but to pull the specific unit's current tax bill, read the exemption line on it, and model the step-up as part of the True Monthly Carrying Cost analysis.
The last structural fact is what surrounds the building rather than what is in it. Fourth Avenue is not landmarked. The Park Slope Historic District and both of its extensions end well east of here, which means no LPC review on this building — and no protection against whatever gets built next door. The Special Gowanus Mixed Use District mapped in 2021 now governs the corridor's future development. Buyers here should look at their windows and ask what could rise across the lot line, in a way that buyers three blocks east never have to.
Architecture and unit composition
The building holds 113 residential units across twelve stories on a 20,544-square-foot lot, with roughly 136,000 square feet of floor area — a built FAR near 6.6 including the commercial component, against the 6.02 residential FAR the district permits. It is a full-block-depth building running from Fourth Avenue back to Fifth Street, with retail and community space at the base and an internal garage held as its own condominium unit.
The apartment stock is 2000s new-construction Brooklyn: efficient plans with open kitchens, in-unit laundry where the line was built for it, elevator service and a mix of avenue-facing and rear exposures. The avenue and rear lines behave very differently — Fourth Avenue is a wide, busy truck route, and the difference in noise and light between an avenue-facing apartment on a low floor and a rear or upper-floor apartment is the single largest driver of value inside the building. Window glazing and the presence or absence of through-wall HVAC are worth checking apartment by apartment for the same reason.
Because the garage and the commercial space are separate condominium units in separate ownership, they are not automatically available to residents and their income does not flow to the residential owners the way a co-op-owned garage would. Establish parking terms specifically rather than assuming a space comes with the apartment.
Building operations
343 Fourth Avenue operates as a resident-governed condominium with an elected board and professional management; management history and the current agent are maintained in The Roebling Research Library and confirmed with clients during diligence. Purchaser review runs through a right of first refusal rather than a board interview, and closing timelines of 30 to 45 days are typical. The amenity and staffing package should be confirmed directly with management rather than taken from marketing material of any vintage; this page will not enumerate amenities it cannot document. What can be said is that the building is elevatored, carries a commercial base and an internal garage under separate ownership, and reached its final certificate of occupancy in 2017.
The capital agenda for a twenty-year-old Brooklyn condominium is entering its first serious phase: façade and FISP/Local Law 11 cycles on a 2006 envelope, roof, elevator work, and the mechanical systems installed at construction. Ask for the reserve balance, the current capital plan, any assessment history, and the board's minutes for the last two years — the mid-2000s Brooklyn condominium cohort is exactly the vintage where construction-quality questions surface.
Recent sales
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Recent closings at this building, sourced from NYC Department of Finance records. Apartment-level detail (line, condition, asking-price context) verified upon consultation request.
| Date | Unit | Price |
|---|---|---|
| May 13, 2026 | 8A | $1,606,175 |
| Mar 31, 2026 | 11H | $1,090,000 |
| Mar 4, 2026 | 4Q | $1,450,000 |
| Nov 13, 2025 | 11B | $1,751,000 |
| Aug 29, 2025 | 9F | $1,250,000 |
| Mar 26, 2025 | 4E | $965,000 |
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 3-00981-7501) 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.
What to know if you’re buying
Read the tax bill, not the listing. A 25-year 421-a with benefits beginning in 2009 is a real monthly advantage today and a scheduled increase later. Model both in the True Monthly Carrying Cost analysis before you decide what the apartment is worth to you.
Exposure is the whole game. Fourth Avenue is a wide truck corridor. Stand in the apartment with the windows open. The premium for a rear or high-floor line is earned.
There is no historic district here. Nothing protects the sightlines or the scale of the block, and the 2021 Gowanus rezoning governs what comes next on the corridor. Look at the adjacent lots and the air above them.
Do not assume parking. The garage is a separate condominium unit in separate ownership. Get the terms in writing.
Ask about the certificate-of-occupancy history and the reserves. The final CO dates to 2017 after a long temporary-CO sequence, and a 2006 building is now entering its first heavy capital cycle. Review the reserve position and the last two years of board minutes.
What to know if you’re selling
Lead with the carrying cost. While the 421-a runs, the monthly number is the building's strongest argument against both older co-ops and newer corridor condominiums. Put the actual figures in front of buyers rather than making them ask.
Be precise about the abatement schedule. Sophisticated buyers will pull the exemption line themselves. Transparent disclosure of the step-down produces better outcomes than vague optimism.
Market the transit case explicitly. Union Street on the R, and the F, G and R at Fourth Avenue–Ninth Street. That is the reason this corridor exists as a market, and it is worth a full sentence in the listing.
Comp inside the corridor. Fourth Avenue condominium sales from 2025 forward are the defensible anchors; historic-district co-op prices and park-front condominium prices are not. And stage for the avenue rather than around it — how the apartment lives with the street outside is what a buyer is actually evaluating on a second showing.
Comparable buildings
If you're considering 343 4th Avenue, also evaluate:
- 500 4th Avenue — the later, larger Fourth Avenue condominium further down the corridor; the newer-vintage alternative
- 505 Court Street (Court Street Lofts) — Carroll Gardens loft-style condominium; the west-of-the-slope alternative
- 11 Hoyt Street — 2020 Boerum Hill new-development condominium; the amenity-led alternative at a higher price tier
- 550 Vanderbilt Avenue — Prospect Heights condominium at Pacific Park; the design-led new-development comparison
- 1 Prospect Park West — prewar park-front condominium; the opposite end of the Park Slope condominium market
- 220 Berkeley Place — 1955 cooperative inside the historic district; the co-op alternative at similar entry pricing
Considering a move at Novo?
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