If you've done a good business with renovating/flipping in Baltimore, then you'll feel pretty comfortable doing the same in DC -- the returns here are even better, and the neighborhoods you'll be working in are a lot less rough. The money here is mostly in rehabbing or building residential, since there's little loft space available.
If you'd like to go corporate, there are plenty of chances to join established firms here, particularly if you're good with ARGUS;
ULI's job board is particularly useful. And with organizations like ULI, NAHB, NAR, etc. here, there's a steady stream of networking opportunities.