I have a client looking for LEED certification of its Commercial offices. The Client has three leased office spaces - 2 spaces ( 5th floor and 7th Floor)in one building and third office space(5th Floor) in another building. Both buildings are located in same IT Park. My question is
1) Can these three offices be certified together since the client is same?
2) One of the office space was in operation 2008, 2nd in 2011 and 3rd in May 2013. Which rating system can be applied here?

Please advise.