I was just meeting with the head of the Columbia Heights Initiative, which does various community projects in the area, they also run the new Columbia Heights-Mt. Pleasant Main Street program and plan to do more work for local businesses.
She had some mapping ideas, in particular finding where there is commercial/retail space for rent, where there are blank walls that could be good for murals, and where there are abandoned buildings.
The first they'd share with local businesses or entrepreneurs who wanted to expand or find space, because otherwise they have to call lots of various realtors and buildings to ask, for the second they have funding and artists who want to do murals but not a good sense of where to do them, and the third they could use to advocate with the city or contact the owners to see what's going on.
Maybe we could do a mapathon to collect this info? It could be along with a regular street survey type activity.
Here's more about the group, and also a map of the area they cover -- mainly the commercial streets in those areas: a few blocks of Park, 14th, 11th, Irving, Kenyon and Mt. Pleasant