A new development plan is emerging for the former Buffalo School No. 70 in South Buffalo. Ellicott Development Co. is considering a number of reuse options for the 101-year-old school on Buffum Street, near Seneca Street. Ellicott is negotiating with the City of Buffalo to purchase the 44,322-square-foot, four-story former elementary school. As a prelude to completing the deal, the Buffalo Common Council agreed to give Ellicott a right-of-way clearance for a portion of Samson Street that is needed…