Downtown’s building boom shows no signs of slowing down, with an Austin-based developer floating plans for a 39-story residential tower.

The building is planned for West Third and Colorado streets in the Warehouse District. Sullivan’s Steakhouse currently occupies the site.

Developer Riverside Resources has submitted preliminary plans for the tower to the city of Austin, according to records obtained by the American-Statesman.

The company declined to comment on the project.

The metal and glass residential tower would include a parking garage and ground-floor restaurant space, according to the submitted plans.

There’s no word on when work might begin on the high-rise or when it might be completed.

Riverside Resources is currently building a luxury condo tower at West Fifth Street and West Avenue. It also developed the upscale Whitley apartment tower in downtown Austin.

More details to come on this developing story.