https://www.openstreetmap.org/way/786346226

Before you add something please check that someone hasn’t already mapped the building, you may need to change a few tags but adding a new building one top of the existing building is incorrect unless your using building:part=* , this is the kind you of thing we (the OSM community) have tools like osmose and osmi to find along with many others since we don’t want overlapping buildings.