Maps Maps! MAPS!!!
As Project Infection is set on a modern Earth, it is very easy to find your own maps for game play. Google Maps and public records are a great place to find them. I have commonly used floor plans at different places I have visited, like public pools or malls. While you're out and about, snap a picture with your phone to use it later! For example, during one of the play tests, my players wanted to steal the Hope Diamond from the DC Smithson while it was infested with zombies. A quick Google search gave us a layout of all three floors to run around in. This lead to the Hope Diamond now being a unique item in the game.
Aside from just Googling it.