Sure, there are plenty of highrise towers to live in in the Galleria . . . area. But what if you want to live in the Galleria mall itself? As in, step out the front door and take in a little Burberry, L.K. Bennett, or Apple Store, maybe still in your Neiman Marcus PJs? The folks at Simon Property Group, the mall owners, began mentioning the possibility of a 300-unit residential highrise at the corner of West Alabama and Sage last fall, when they announced the big Galleria III redo (going on now), which is scooting Saks Fifth Avenue over to the former Macy’s spot fronting Sage and open up about 100,000 sq. ft. of new retail space in its wake. And now they’ve gone and shown on a map where the new tower might go.