We have a 6 story multi-tenant downtown office building located in close proximity to public transportation. The building also has 4 levels of underground parking, where you can enter the garage elevator and bypass the lobby to go directly to each floor. We are trying to determine the best method of conducting the Option 3, Approach 2 random sampling of the building population by conducting in person surveys by “standing by the elevator” approach as discussed in previous threads and trying to determine the best approach in order for the survey to be statistically representative of the building population. If we stand in the lobby only, we will miss those that have parked in the garage and bypassed the lobby on their way to their floor. Has anyone had any experience with sampling such a building? Would it make sense to have one surveyor located at the entrance to the parking garage to survey cars as they drive through and one in the lobby to catch those coming through the front entrance to the main elevator bank ? Or would it be more appropriate to station surveyors at each level above the lobby and survey as occupants exit onto their respective floors? Any input is appreciated!