DCRA permit: 406 U St NW in LeDroit Park to get two-story rear addition w/new cellar -- conversion to a two-family flat

See this DCRA permit for LeDroit Park spotted by Washington Business Journal reporter Michael Neibauer:

406 U St. NW: This two-story, single-family home will get a two-story rear addition with new cellar as it is converted into a two-unit building.