As the recent census data show, more people are moving to the District each year and sticking around. While huge cranes dot the skyline in many areas of the city, there may be an unexpected answer to the District’s housing conundrum: alley dwellings. Throughout the District, the development of alley lots is being embraced as a way to enliven formerly under-utilized spaces and provide a source for more-affordable housing. Such was not always the case. When Pierre L’Enfant was commissioned to design the City of Washington, he never planned on there being alley communities. However, as an unexpected result of wide alleys and open plots of land, builders created lower income housing described as “mini-ghettoes” by James Borchert in his…