Upper level platform at Myrtle-Broadway?

I know that the upper level platform (above the platform for catching the J and M) is a remnant of the former BMT Myrtle Ave elevated. But why do the buildings up there still exist and have lights on (see photo)? Are they in use for something?

I know that the upper level platform (above the platform for catching the J and M) is a remnant of the former BMT Myrtle Ave elevated. But why do the buildings up there still exist and have lights on (see photo)? Are they in use for something?