Prolman Realty, Inc. of Nashua, has leased 2,400 s/f of office space at Carriage Depot, 135 Rte. 101-A, to Schaefer Mortgage Corp. according to Lisa Morrison and Mark Prolman who represent the owner, Hardman Companies. Schaefer Mortgage was represented by Penelope Seaver of Bean, Seaver Smith Associates of Milford, N.H.