Before May 20, 2009, most renters lost their leases upon foreclosure. The rule in most states was that if the mortgage was recorded before the lease was signed, a foreclosure wiped out the lease (this rule is known as "first in time, first in right"). Because most leases last no longer than a year, it was all too common for the mortgage to predate the lease and destroy it upon foreclosure.

These rules changed dramatically on May 20, 2009, when President Obama signed the "Protecting Tenants at Foreclosure Act of 2009." This legislation provided that leases would survive a foreclosure -- meaning the tenant could stay at least until the end of the lease, and that month-to-month tenants would be entitled to 90 days' notice before having to move out (this notice period is longer than any state's non-foreclosure notice period, a real boon to tenants).

An exception was carved out for the buyer who intends to live on the property -- this buyer may terminate a lease with 90 days' notice. Importantly, the law provides that any state legislation that is more generous to tenants will not be preempted by the federal law. These protections apply to Section 8 tenants, too.

Importantly, tenants who live in cities with rent control "just cause" eviction protection are also protected from terminations at the hands of an acquiring bank or new owner. These tenants can rely on their ordinance's list of allowable, or "just causes," for termination. Because a change of ownership, without more, does not justify a termination, the fact that the change occurred through foreclosure will not justify a termination.