D.C. developer, businessman and philanthropist Calvin Cafritz, the eldest son of real estate icon Morris Cafritz and his wife Gwendolyn, died Thursday at Sibley Memorial Hospital. He was 91. The Morris and Gwendolyn Cafritz Foundation, the charitable organization Calvin Cafritz had led since 1989, confirmed his passing and provided a copy of his obituary, which didn't disclose cause of death.