When downtown’s Forty-One Marietta tower sold last summer for $11.5 million—a major win for the seller who’d bought it for $4.7 million in 2015—rumors swirled over what would become of the 13-story office block.

Now, architectural documents obtained by Curbed Atlanta show a glimpse of the building’s planned future: It could be converted into an apartment building, potentially boosting downtown’s population base, as a smattering of other rental projects have done in recent years.

Details are scant, but renderings of the renovation plans shared by architecture firm Office of Design show that Charlotte-based FCA Partners would lead the development, converting the circa-1976 office building into a 131-unit apartment tower.

Forty-One Marietta, named after its address, stands at the corner of Marietta and Forsyth streets, about a block west of downtown’s Woodruff Park.

Among other modifications slated for Forty-One Marietta is the addition of a penthouse club room with an adjoining pool.

Early renderings also suggest the building’s facade—designed in the early 1970s by architecture firm Tooms, Amisano, and Wells and—is headed for a major overhaul by Winter Construction.

It’s unclear if the apartment tower would cater to downtown’s student population, and what would go beneath the residential component—restaurants, retail, etc.

As recently as 2015, the entire building was vacant.

This story was updated on January 16, 2018 at 2:30 p.m. to include updated renderings from Office of Design.