Replace existing window with a new door to the outside terrace in unit 501 at 1939 12th street nw. Washington dc 20009. A structural engineer determined through an invasive inspecting on june 22 that the door installation will not require any structural change as the door is narrower than the existing window and no supporting beam would be affected in the process. The door will be an aluminum frame full lite entry door 3-0" x 70". Visually, it will be similar to the existing door on the opposite side of the terrace wall