You tell the LL to pound sand... Just as you cannot break the lease, the LL cannot break the lease NO MATTER what their circumstance...
There are NO laws stating a LL can legally terminate your lease on a whim... The only way is if it is written in your lease, and even if it is, it needs to conform to your states LL/T laws...
You are under NO obligation to move out. Your only obligation is to pay rent on time, every month for the duration of the lease...
You can approach the LL and ask for a release from the lease, but MAKE SURE you get a release in WRITING. Do NOT do a verbal release as it will come back to bite you if the LL wants to get back at you... Make sure the release states that you are released from any FUTURE money claims, and it completely terminates the lease...
Most people ask for a monetary compensation for the hassle of moving... You can include all associated moving costs to vacate the unit and give it to the LL... If the LL says no, then you say ok, and stay where you are for the remainder of the lease...