I've finally uncovered a roundabout way to find out about pending raze permits (right now, raze permit applications are not tracked or listed in any way on DC.gov
--waaah!). The city's Historic Preservation Office
sends out via e-mail weekly permit reports for the entire city (the HPO is contacted by the Department of Consumer and Regulatory Affairs
to confirm that building/raze permits aren't for buildings with some landmark status or other hold). Recently mailings have indicated that raze permits are in process for 1015 Half Street
(Nation) as well as most of the buildings on Monument Realty's properties
along Half, N, and South Capitol Streets (26, 30, 32, and 68 N Street, 1241 and 1243 Cushing Place, and 1236 South Capitol). This reports from HPO don't mean that razing is imminent (for instance, the Monument Realty raze permit requests came through HPO in mid-October), but do show that plans for demolition are more than just theoretical. UPDATE:
I knew I forgot something when I posted this; I meant to include that, while I haven't seen a raze permit, a correspondent has reported that tenants told him that the beige brick building at South Capitol and O SW is scheduled to be demolished just after the New Year, to make way for the 1325 South Capitol
244-unit residential building.