Thirty Condos on Prospect Park West at 150 Prospect Park West
Welcome to 150 Prospect Park West, the largest of the new Park Slope condominium projects I am tracking. It is a thirty-residence building, six stories with an elevator, sitting right on Prospect Park West with the park essentially across the street. This is also a unique one because it is a conversion from a rental building to a condo. This will have more timing nuances, but as I personally live in a building like this that was converted in 2006, I think these are real opportunities for pre-war charm blended with modern conveniences.
New condominiums with an elevator directly on the park are extremely rare- I expect these to be quite a in-demand commodity once completed.
Where Things Stand
Here is where things stand: 150 Prospect Park West's offering plan was submitted to the New York State Attorney General on November 26, 2025, 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. At thirty units, this one will have a real sales launch once it is accepted, so getting on the early list is worth doing now.
Because this is a conversion, the timeline will vary depending on what this means, but once the process is accepted, they will start communicating. Most conversion plans in NYC are non-eviction, which means tenants who do not want to buy cannot be forced out, and tenants in occupancy get an exclusive 90-day window to purchase their unit at an insider price before it goes to the broader market. Senior and disabled tenants may also qualify for additional long-term protections.
The Numbers So Far
The plan calls for 30 residences across six floors totaling roughly 35,300 square feet, a mix of one-, two-, and three-bedroom homes. This is a full-scale elevator building rather than a brownstone conversion. Pricing will be released once the Attorney General accepts the plan.
Curious About the Process to Buy in a New Development?
Read my blog post all about new development.
A Full-Service Building on the Park
At thirty residences with an elevator, 150 Prospect Park West is a larger, full-service building than the typical brownstone conversion. The amenity plan includes an elevator, bike storage, additional private storage, laundry, and a pet-friendly policy. The building dates to 1921 and is being reimagined as condominiums, which is a rare thing to see directly in the park.
The Heart of Park Slope
Park Slope is the Brooklyn neighborhood that most people picture when they picture Brooklyn, with brownstone-lined streets, Prospect Park at your doorstep, two of the borough's most coveted commercial avenues, and District 15 schools that draw families across the borough. 150 Prospect Park West sits directly on the park, which is about as good as a Park Slope address gets.
The F and G at Seventh Avenue are about a 4-minute walk.
The D, N, and R at Fourth Avenue and Ninth Street are about 15 minutes.
The B, Q, and S at Prospect Park are about 16 minutes.
The 2 and 3 at Grand Army Plaza are about 17 minutes.
District 15-zoned elementary school is P.S. 107 John W. Kimball.
Prospect Park is essentially across the street, with the Long Meadow, playgrounds, and the Greenmarket all close by.
Designed for Modern Brooklyn Living
A thirty-unit elevator building directly on Prospect Park West, in the heart of District 15, is the kind of address that rarely comes available new. For buyers who want a full-service building with the park as a front yard, 150 Prospect Park West is one of the more significant new offerings in the Slope right now.
Discover Other Similar Projects
If you like the scale and location of 150 Prospect Park West, take a look at 431 7th Avenue in Park Slope, 270 14th Street in Park Slope, and 122 3rd Place in Carroll Gardens, all boutique condo projects in or near Park Slope.
Your next Brooklyn home may be closer than you think. Let’s talk if you’re exploring a move.