I am not sure that I understood you completely.
If you would like to have some images that you can use as a filter, you should probably use custom shapes to do it. Here a link to the excellent entry of Dash Davidson explaining how to do it : How to use custom shapes as filters on your dashboard | Tableau Software .
But, if you have planned to use a background image ( as a plan of all your buildings), you should probably watch this video Background Images , and you can add a small circle for each building on the map created, and use them as a filter.
If it s not what you are looking for, you should probably send a packaged workbook.
I hope it helps.