Owners of the commercial space in the 25-story Landmark Towers have put their interest in the downtown St. Paul building up for sale.

Built in 1982, the St. Peter Street building features a 321-stall parking ramp, 20 floors of office space and five floors of condominiums.

The commercial owners are selling both their office space and their owned ramp units. The residential ownerships of the building are not included.

No asking price was released.

The seller is hoping to take advantage of recent developments — and prospects of more — in downtown St. Paul.

“Downtown St. Paul is experiencing some incredible revitalization with the influx of new residents, access to light rail transit and around-the-clock activities and services,” said Frank Sherwood of CBRE’s Minneapolis office, which is marketing the tower’s commercial space.

The seller hopes to close a deal by the end of 2017.