(HR) Johnston Building - Int. Structural - PROPOSED WORK INCLUDES SELECTIVE INTERIOR STRUCTURAL DEMOLITION AND FRAMING. WORK INCLUDES: CREATION OF ADDITIONAL BASEMENT FLOOR AREA WITH NEW STRUCTURAL SLAB AND FRAMING FOR FUTURE ELECTRICAL AND MECHANICAL SPACE, NEW STRUCTURAL FRAMING AND BUILDING ENVELOPE FOR STAIR EXTENSION TO PENTHOUSE LEVEL, NEW RETRACTABLE SKYLIGHT AND PENTHOUSE ADDITION. PARTIAL REMOVAL OF THE 17TH FLOOR AND NEW FRAMING TO CREATE A DOUBLE HEIGHT BALLROOM AT THE 16TH FLOOR. NEW STRETCHER COMPLIANT SERVICE ELEVATOR AND HOISTWAY SERVING BASEMENT TO 17TH FLOOR.