A little over two years ago,Charles Blaichman’s CB Developersbegan constructionon a 19-story, mixed-use building at210 East 39th Street.Designed byRawlings Architects, theMurray Hillbuilding has a ground-floor retail podium, glassy second-story amenity space, and terra cotta rainscreen-clad frame. In all, there will be 57 rental units, 11 of which are set aside for those earning no more than 60 percent of the area media income. These affordable apartments includeone $833/month studio, seven $895/month one-bedrooms, and three $1,082/month two-bedrooms.