DC zoning rules are often more restrictive than the Congressional height limit, so there is plenty of space to improve using just what is within DC’s own power to change.

Just looking at Columbia Heights, for example, all of those RA-2 areas are limited to 50 ft, which is why you have all those 4-5 story buildings between 14th and 16th. The height restriction is 90ft for those blocks, which means we can almost double the available volume just by fixing the zoning.

The bigger question is whether to let denser apartments encroach into the townhouses. You could add a lot of housing to that neighborhood simply by expanding RA-4 to 13 between Girard and Park.