Unfortunately, you will eventually have to leave the property. Because you have a lease that does not expire until June, 2013, Fredimac is bound to honor it and cannot attempt to evict you before then (unless, of course, you were to fail to pay rent or violate the lease agreement in some way). Fredimac obviously really wants the property, which is why they offered you the other two options.
You say "original lease was till 6-213". Do you mean to imply that you are currently under an amended lease with a different date of expiration? You say that Fredimac will evict you on day 91, which implies that your lease has a different expiration date than the "original lease". You should certainly review your current lease with a local landlord/tenant attorney to discuss your options.
Mr. Vicary is licensed to practice law in Florida. The response herein is not legal advice and does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information about the matter within the question. Oftentimes the question does not include significant and important facts and timelines that, if known, could significantly change the reply and make it unsuitable. Mr. Vicary strongly advises the questioner to confer with an attorney in your state in order to ensure proper advice is received.
FreddieMac can't use the 90 day notice, as they aren't a purchaser at foreclosure sale who intends to use the property as his residence.
You can stay until the end of your lease if you pay the monthly rent to FreddieMac.
You should send in your rent payments to FreddieMac via certified letter to prove that
you did so.
You have at least three months to look for a new place.
You can take one of the other options if that looks better to you.
$3,000.00 would make a nice down payment on a new place and maybe
some cash towards rent, too.