Boosted by the emerging cultural quarter across the street and plans for a starchitect-designed luxury tower nearby, sales activity has picked up at the 67-story Marquis, a mixed-use condo tower at 1100 Biscayne Blvd. that was Miami’s tallest residential tower built in the last housing boom.

A 50-unit hotel component in the building has changed hands for an undisclosed price, the Daily Business Review has learned, and the sale of a penthouse on the tower’s 61st floor appears to have shattered the per-square-foot price record for downtown condo units.