(ST LUKES - 4 CENTRAL - EXTERIOR WALL/CORRIDOR EXTENSION - 4TH FLR) This building is fully sprinklered. To create an opening through the existing exterior corridor wall and the existing exterior penthouse mechanical/electrical room wall and construct two new exterior walls with a roof, adding approximately 15 sq. ft. to the existing penthouse and changing the use to a storage room with connection to the fourth floor hospital corridor. To install a new rated door between the hospital corridor and the new expansion and storage room, all per the approved plans, red-lined notes on plans and attached plan review clarifications. The integrity of the existing 2-hour floor / roof between the third floor and the new storage area shall be maintained or provided, if not existing, at protection of openings, penetrations or ducts. Verify sprinkler system protection in the addition and storage room. To remove existing mechanical/electrical equipment within the existing penthouse. drs