There are Windows on the first floor, but without examining them, it's hard to know if they'd even open. Given the additional security on the backdoor (not present on the backdoor of house 3), you wouldn't be surprised if the Windows were extra secure.
There is a car port, not a garage, but it's attached to the house. There is no second floor.
The actual car is in house 3.
Sorry for not posting earlier, a death in the family (my grandmother) pushed holiday travel plans up.