In Special Mixed Use Districts where the designated Residence District is an R3, R4 or R5 District, the height and setback regulations of Sections 23-60 and 43-40 shall not apply to mixed use buildings. In lieu thereof, no building or other structure shall exceed a height of 35 feet within 25 feet of a street line. Beyond 25 feet of a street line, no building or other structure shall exceed a height of 60 feet. Notwithstanding the foregoing, the provisions of Sections 23-62, 24-51 and 43-42 (Permitted Obstructions) shall apply to any mixed use building.