OFFER TO PURCHASE FOR CASH 40 SHARES OF PREFERRED STOCK OF FSP 50 SOUTH 10TH STREET CORP. AT $50,000 PER SHARE by: MPF DEWAAY FUND 8, LLC, MPF INCOME FUND 26, LLC, MPF DEWAAY FUND 7, LLC, MP INCOME FUND 12, LLC, MPF FLAGSHIP FUND 14, LLC, MPF PLATINUM...