Erect reviewing stands as per engineers drawing

I would like to install 3 windows into an exterior wall which overlooks a closed in court yard. The court yard is completely enclosed on all four sides by walls of the building. The court yard is within the footprint of the building. They will be 3x5 windows installed approximately 6 feet apart on center on the second floor of the building. Add one window to the rear elevation. Remove 2 non load bearing walls and construct one non load bearing wall and install new flooring to change layout of offices.