The office building has a total of 5 floors, a business per floor (Suite 200, 300, 400, 500), with the exception of the ground floor being a sort of open-air lobby with the elevator. The fifth floor is occupied by a charity called the "Women's International Zionist Organization". So yeah, it does take up the entire floor. 
It's a weird building. The elevator takes you and acts like the main door to these 4 offices. I don't know if you can add this option but the Suite 500 business required a key card access to get on their level. Inside the elevator, one can press on all the floor buttons except for the 5th.