Located in Mobile, RSA Battle House Tower is Alabama`s tallest building. The building owned by Retirement Systems of Alabama (RSA), is the tallest on the Gulf Coast of the United States outside of Houston, Texas. Replacing Wachovia Tower in Birmingham as the tallest building in Alabama and also RSA–Bank Trust Building, the RSA is named for the neighboring Battle House Hotel, which is now part of the tower complex. Battle House Hotel was restored and renovated as part of the tower project. Its foundation slab is over 7 feet thick, with just over 5 feet of it resting below the natural water table of downtown Mobile. The spire atop the building was installed by a Sikorsky S-61 helicopter in 2006, to finish the height of the building at 745 feet. The tower consists of 25 office floors, 3 lobby floors, 4 hotel floors and 1 service floor together with 20 elevators and 570,000 square feet of column-free floor space. Its lit crown is visible from 30 miles along Mobile Bay on a clear night.