Two Boutique Condos in an 1883 Prospect Heights Building at 139 Saint Marks Avenue
Welcome to 139 Saint Marks Avenue, an intimate two-residence condominium inside a restored 1883 building on a prime Prospect Heights block, a short walk from both Seventh Avenue and the Atlantic Avenue hub. It is one of the freshest filings I am tracking, and it comes from the same team that is converting 273 Park Place.
Where Things Stand
Here is where things stand: 139 Saint Marks Avenue's offering plan was submitted to the New York State Attorney General on May 13, 2026, and it is currently awaiting acceptance. That means no units are for sale yet, there is no public pricing, and reservations cannot be taken. From here, it typically takes about 6 to 12 months for the Attorney General to review and accept a plan. Because the plan was just filed, getting on the early list now puts you about as far ahead as possible.
The Numbers So Far
This is a true micro-building: just two residences inside roughly 3,650 square feet across four floors, with a private backyard in the plan. With only two homes, expect generous, floor-through-style layouts. Individual pricing will be released once the Attorney General accepts the plan. I would expect a premium price tag for these two condos. There will likely be a similar price point and structure for the units at 189 Prospect Place.
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A Boutique Condo Experience
With only two homes, 139 Saint Marks Avenue is about as intimate as a condo building gets. It is a careful conversion of an 1883 building, among the oldest in this batch of new condos, preserving the historic character while bringing the systems and layouts fully up to date. The plan includes a private backyard, with a walk-up layout and an intercom. The renovation architect is JK Design, and the project is held by RH ST Marks Ave LLC, the same ownership group behind the nearby 273 Park Place conversion.
The Heart of Prospect Heights
I’m incredibly biased, as this is my neighborhood for a decade, but this truly is the most central location. Prospect Heights is the most central piece of brownstone Brooklyn, adjacent to Park Slope, Crown Heights, Fort Greene, and Clinton Hill, with Prospect Park, the Brooklyn Museum, and the Brooklyn Public Library all within a few blocks. The combination of brownstone blocks, prewar buildings, and the cultural anchors at Grand Army Plaza is hard to replicate anywhere else in the borough.
The B and Q at Seventh Avenue are about a 3-minute walk.
The 2 and 3 at Bergen Street are about 5 minutes.
The A and C at Clinton-Washington Avenues are about 8 minutes.
The full Atlantic Avenue and Barclays Center hub is about 10 minutes.
District 13 zoned options are typically P.S. 9 Sarah Smith Garnet and P.S. 138, with MS 51 William Alexander.
Walkable to Prospect Park, the Brooklyn Museum, the Brooklyn Botanic Garden, and the restaurants and cafes along Vanderbilt and Washington Avenues.
Designed for Modern Brooklyn Living
A two-unit conversion with a private backyard, steps from Seventh Avenue and minutes from the Atlantic Avenue hub, is a rare and quiet kind of opportunity in Prospect Heights. For a buyer who wants a brand-new home with the character of a historic building and essentially no shared building to manage, 139 Saint Marks Avenue is worth knowing about this early.
Discover Other Similar Projects
If you like the scale and timing of 139 Saint Marks Avenue, take a look at some other upcoming condo converted projects- 82 Sterling Place, 132 6th Avenue, 39 South Portland Avenue.
Your next Brooklyn home may be closer than you think. Let’s talk if you’re starting to explore this market and are curious about brownstone condos versus brownstone.