The vault door to the home theater pictured below.
We attended an open house of the entire Pierce School Lofts building last weekend and were given permission to photograph whatever we wanted.
The Pierce School was built in 1895, bought by the owners in 2000 for $275,000 as a flooded and rodent infested shell and converted to condos in 2005. All the units are for sale, ranging in price from $359,000 to $699,000 for the lower lofts and $3,399,000 for the 9,500 square foot penthouse.
For more information on this property see http://dc.urbanturf.com/articles/blog/own-a-piece-of-the-pierce-school/13587
Penthouse: Home theater in a vault, posted earlier