I'm not a lawyer, so what follows is not legal advice. However . . .
However, often and in general, the answer to your question is: No. The landlord isn't breaking the lease by selling.
What generally applies--unless the lease specifies something different--is that the lease agreement continues to apply both to you and to the new owner.
Example: You signed a 1-year lease on June 1, 2011. Again--assuming the lease doesn't provide otherwise--you've got a valid lease until May 31, 2012. And if the landlord sells the property to someone else before May 31, 2012, that new owner is obligated to fulfill the terms of the existing lease. The lease still runs to May 31; the amount you pay is unchanged.
And--also very important for you--any security deposit you gave to the previous landlord must be returned to you by the NEW landlord. (Sometimes people who purchase rental properties forget to make sure that such deposits are transferred over to them.)
Hope that helps.
It depends on what the lease says. A standard lease will say that the tenant has the right to 30 or 60 days notice before having to move out. If the landlord gives you this much notice, then he is within his rights (if that is what the lease says). There is a chance that the new owner will want to keep the tenant in the property, such as if he or she is purchasing as a rental property and would be searching for a tenant anyway. If the new owner wants to make it his or her own residence, then they will have to give the appropriate amount of notice, per the lease agreement, and then you'll have to move out. Good luck, Heidi!
Start by reviewing your lease. Many leases will anticipate the possibility and explain what both parties rolls are in selling the rental. If your lease does not include anything about this, review the Landlord Tenant Law of Washington, I've included a link below.
As an agent, we are familiar with leases, but we are not attorneys. You may want to check with the State Attorney General's Office on Monday to understand your rights and obligations further. Sorry for your situation.
You can also just ask to get out of the lease if that is your intention. Vacant properties sell easier than tenant occupied.