Having sex in an administration building is close to doing it in any other building it has a touch of "danger" that differs.
Easiest option is to do it in a closed office. Requires to be silent and not as loud as I am. A blowjob is a nice way to get some faster handling of your file
For the more adventurous ones there is the restroom. Even better the staircase as these are that much under video surveillance.
I enjoy doing it with my man in some quiet part of the building while we wait for an appointment ...
Another way to enjoy these buildings .... The remote controlled vibrator ... As the ones you can find here (check out the menu)