509 O St NW, 20001 again

There was a mention on the Shaw Neighborhood list about the property, that is common with sticky vacant houses, From David Smith:

Meanwhile, the unpaid taxes continued to pile up, it never went on the annual tax sale as a complete property, it kept mysteriously reverting from Class 3 or 4 to Class 1 Residential on the OTR database, and continued to deteriorate visibly.