A Brooklyn brownstone in the affluent Fort Greene neighborhood has listed for the first time in 45 years.

A landmarked building, the multi-family property, at 15 S. Portland Ave., boasts six bedrooms and five baths in total — and is priced at $6.1 million.

Built in 1930, the spread features pre-war details that include pocket doors, regal wainscoting and woodwork.

There are decorative fireplaces and custom built-ins throughout.

With an Italianate facade, the townhouse is less than half a block from the popular summer hangout Fort Greene Park and features three spacious apartments, optimal for rental income.

The home includes a garden-level owner’s duplex. Made up of two bedrooms and 2.5 bathrooms, this residence begins on the parlor level with an expansive great room. There’s also an eat-in kitchen with a waterfall island and a fully equipped butler’s kitchen.

The owner’s dwelling has access to a wraparound balcony with stairs to the backyard.

On the second level is a one-bedroom with a windowed full bathroom. The unit also comes with a windowed home office and an open plan layout.

The kitchen features a breakfast bar, a dishwasher and a gas stove.

The final unit, on the third level, holds two bedrooms and a windowed full bathroom, also with an open plan layout.

It features a terrace, ideal for alfresco entertaining in the warm months. The corner kitchen holds a ceiling-mounted oven hood.

The second bedroom features pocket doors and can be easily converted to an office space, the listing notes.

Occupying roughly 4,700 square feet, every unit comes with a coveted washer/dryer.

Tricia Lee with Serhant holds the listing.