D.C. planning officials want to fill the city's empty offices and open space with art galleries, makeshift tennis arenas and other cultural nuggets.
It's called "temporary urbanism," and city planning director Harriet Tregoning says officials are working to develop standard procedures to encourage the concept.
At CityCenterDC, home of the old Washington Convention Center, the Washington Kastles play their home tennis matches on a makeshift court. A trapeze is often set up on one corner of the huge lot.
Tregoning says that's the kind of thing the city should do more routinely to liven up the streets.