WASHINGTON - The SWAT team, the overdose, the complaints of pot smoke in the air and feces in the stairwell - it would be hard to pinpoint a moment when things took a turn for the worse at Sedgwick Gardens, a stately apartment building in northwest Washington. But the Art Deco complex, which overlooks Rock Creek Park and is listed on the National Register of Historic Places, is today the troubled locus of a debate on housing policy in a city struggling with the twin crises of homelessness and gentrification. **SNIP** But the situation at Sedgwick Gardens is different: Many...