361 Union Street is a two-home condo conversion of an 1899 Neo-Grec brownstone in Carroll Gardens, steps from Carroll Park and about two minutes from the Carroll Street F and G. Both homes are triplexes with four or five bedrooms, and sales launched in September 2026.
Where Things Stand
The offering plan was submitted to the New York Attorney General on November 4, 2025, and has since been accepted. Both homes were listed for sale on September 17, 2026. As of November 1, 2026, both are still available. Join my early access list below and you'll hear from me if anything changes, before it reaches StreetEasy.
The Numbers So Far
As of November 1, 2026, from the public listings:
Garden Triplex: four bedrooms, four baths, 2,501 square feet, asking $4,700,000 (about $1,879 a square foot)
Monthly costs for the Garden Triplex: common charges plus taxes of about $2,518 per month
Penthouse Triplex: five bedrooms, three and a half baths, 2,096 square feet plus a 903-square-foot roof terrace, asking $4,500,000 (about $2,147 a square foot)
Monthly costs for the Penthouse Triplex: about $2,114 per month
This same sponsor built 301 Degraw Street nearby, a building where I had a client purchase and they've been very pleased with the property.
Available home: Garden Triplex, 4 bed, $4,700,000
Available home: Penthouse Triplex, 5 bed, $4,500,000
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.
A Closer Look at the Building
The conversion keeps the 1899 brownstone's historic facade and divides the house into two stacked triplexes: the Garden Triplex at the base of the house and the Penthouse Triplex at the top, with a private roof terrace of just over 900 square feet. With only two homes in the building, it lives much more like a townhouse than a typical condo.
Want floor plans for either home? Send me a note and I'll share them.
Carroll Gardens Highlights
Carroll Gardens is one of Brooklyn's most tightly held brownstone neighborhoods: tree-lined blocks with deep front gardens, an Italian-American history that still shows up in the bakeries and shops along Court Street, the restaurant row on Smith Street, and Carroll Park at its center. The building stock is small-scale, so new condos here are rare.
The F and G at Carroll Street, about a 2-minute walk
The D, N and R at Union Street, about 12 minutes on foot
Carroll Park steps away, and Smith Street dining nearby
Katie's Take
I track every new development in Brooklyn, and here's how this one compares: at about $2,010 a square foot on average, 361 Union Street sits at the top of the Carroll Gardens condos selling right now, alongside 420 Court Street. It's also the only one offering three-level homes with four or five bedrooms. If you've been weighing a full townhouse but don't want to take on a whole building, this is the closest thing to it in the neighborhood.
Want to see it in person? Let's talk.
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