Peregrines historically live on rock cliff ledges but also do well with tall concrete, bridges, buildings and smokestacks which have similar features. Their range is about 30 miles with their nest in the center of their range. They do not like other falcons within 3 miles of their nest site.
Nesting has already begun and chicks are expected to hatch in early May. Just go to http://www.lbwl.com/FalconCam2008.asp.