The first floor of the building that we are working on is 10 feet narrower than the upper floors, in order to accomodate a walkway around a courtyard. The walkway is covered by the overhang from the second floor. We are trying to determine the line of sight for the interior windows on the first floor, but aren't sure how to calculate for this overhang. It definitely affects the line of sight for the fixtures. Any advice would be welcome. Thanks.