This is a huge composite picture, so don’t click on it unless you have the megabytes to spare. This elegant apartment building on Craig Street had a typically Pittsburgh problem to solve. The lot is irregularly shaped and (of course) not level. The architect’s answer was a façade that is varied enough to mask the fact that it does not quite line up with the street. At first glance, the front seems symmetrical; the second and third glances will reveal the curious staggering of the wall.