Demolition of existing fourth floor to Harling House and construction of replacement fourth floor and additional fifth and sixth floors within Use Class B1; Demolition of existing fifth floor to 195-205 Union Street and construction of replacement fifth floor and additional sixth and seventh floors plus extension to rear within Use Class B1; Side infill extension between 195-205 Union Street and Harling House; Change of use of ground floor of 195-205 Union Street from B1 to part B1 (office reception), part A3; Change of use of basement to 195-205 Union Street from B1 to flexible A3/D2; Erection of a seven-storey building plus basement on vacant land at 183-193 Union Street for Class B1 and flexible A1/A3/D2 use.