Spawning Zombies inside buildings

Question

I have a couple of questions about the spawning of zombies inside opened buildings in Zombicide.

1) When an actor opens a door, should we draw a zombie card for every room of the building, or just one per building?

2) If the players begin the game inside a building, are there zombies in it?

Answer 1

1) One per room.

2) No.

Quoting rules summary:

Opening the first door in a building (except the start area) generates Zombies in each zone. For each zone, draw a Zombie card and place them accordingly.

Answer 2

From the rule book (page 8) under the Opening a Door heading, you draw one card for each room (aka Zone).

Opening the first door of a building reveals all Zombies which are inside. Point to each Zone of the building, one after the other, drawing a Zombie card each time. Place the corresponding number of Zombies on the correct Zone (see Zombie's turn).

From the FAQ (page 1), no Zombies spawn in the starting building.

Q: Should I draw a Zombie card when opening the door of the building containing the Player starting area?

No.