Two Boutique Condos in an 1883 Prospect Heights Building at 139 Saint Marks Avenue

Nov 1

Welcome to 139 Saint Marks Avenue, two condos inside an 1883 house on a prime Prospect Heights block, a short walk from both 7th Avenue and the Atlantic Avenue hub. The sponsor, RH ST Marks Ave LLC, is the same group converting 273 Park Place, and the plan includes a private backyard.

Where Things Stand

The offering plan for 139 Saint Marks Avenue was submitted to the New York State Attorney General on May 13, 2026, and is awaiting acceptance. No units are for sale yet, there is no public pricing, and reservations can't be taken. Across the 53 Brooklyn projects I've tracked from filing to acceptance, most were accepted 5 to 9 months after filing (about 7 months is typical), which points to acceptance between now and roughly February 2027. Join my early access list below and you'll hear about pricing and launch timing before it reaches StreetEasy.

What We Know So Far

Two condos in a renovated three-story 1883 two-family house, with a private backyard in the plan
About 3,570 square feet of total floor area in the DOB filing, or roughly 1,790 square feet per home
Likely floor-through or duplex homes, based on that size (the final mix isn't public yet)
Offering plan filed: May 13, 2026
What's next: Attorney General review typically takes several months, and pricing becomes public once the plan is accepted

Buying in a New Development?

New construction works differently than a resale: offering plans, sponsor contracts, closing costs and timelines all have their own rules.

Read my guide to buying a new development condo →

A Closer Look at the Building

With only two homes, 139 Saint Marks Avenue is about as intimate as a condo building gets. The renovation keeps the 1883 house's historic character while bringing the systems and layouts fully up to date, and it's a walk-up with an intercom. I would expect a premium price tag for these two condos, and likely a similar price point and structure to the homes at 189 Prospect Place. Final pricing, common charges and the unit mix will be public once the plan is accepted.

Prospect Heights Highlights

I'm incredibly biased, as this has been my neighborhood for a decade, but this truly is the most central location. Prospect Heights is the most central piece of brownstone Brooklyn, bordering Park Slope, Crown Heights, Fort Greene and Clinton Hill all at once. Prospect Park, the Brooklyn Museum, the Brooklyn Botanic Garden and the Central Library are all within a few blocks, and Vanderbilt and Washington Avenues carry the neighborhood's restaurants and cafes.

The B and Q at 7th Avenue, about a 3-minute walk
The 2 and 3 at Bergen Street, about 5 minutes
The C at Clinton-Washington Avenues, about 8 minutes
The full Atlantic Avenue-Barclays Center hub, about 10 minutes

Katie's Take

I track every new development filing in Brooklyn, and this one stands out as one of three two-home brownstone conversions in Prospect Heights' pipeline, alongside 273 Park Place and 196 Saint Marks Avenue. At roughly 1,790 square feet per home it's the most compact of the three, with a private backyard in the plan, which could make it the more approachable way into this kind of building. The plan was filed May 13, 2026, so acceptance most likely comes by February 2027, and that's when we'll see where pricing lands next to its sister project on Park Place.