Canterbury Woods, an upscale senior development agency in Amherst, plans to redevelop the former hospital as a new haven for seniors. Assemblywoman Crystal D. Peoples-Stokes, D-Buffalo, said that such a facility could fill a need for senior citizen housing that could keep people in the city. ?There is a certain scale of economy that comes with a critical mass of seniors, much like for young people,? Peoples-Stokes said in discussing the potential benefits. ?It could also bode well for additional businesses in the area.?