What are my legal rights or options as the renter?

I have been leasing a home for nearly five years. The owners have just provided me with a written 30-40 day notice of having to vacate the property because they have decided to sell. Initially entering into the lease agreement, the lease term was for one year. After the lease term expired, I wasn't provided with a new lease agreement until after I had been in the property an additional year, and then receiving another ONE year term lease agreement the following. Although I have asked for a renewed ONE year term lease agreement several times, I had never received another since, but I have still been leasing the property until this day. Trying to work out some arrangements to ful-fill the rest of my lease term, I had been told that once a lease expires, I am automatically placed into a month to month status as long as I'm paying rent. So unbeknowing to me, I have been in a month to month rental for the last almost three years. So if there was never any verbal acknowledgment of the month to month leasing status, and no documentation to dictate such, am I obligated to adhere to the guidelines from the last provided lease, or does this all of sudden month to month rental null and voids any previous rental agreements??
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That is all standard. When a lease expires it automatically goes to a month to month agreement with all the same terms and conditions of the original lease. No acknowledgment of this is required. They can legally give you 30 days notice for no reason. There is not really anything you can do to fight this.

Not fair, but legal.
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Month to month simple renews your lease on a month to month basis.You are under the same terms as the original lease.
You cannot stop the owners from selling the property.You are making a problem where none actually exsist.
They gave you ample notice to move out.
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Month-to-month doesnt void any of the agreements in your lease other than the term. Since you are on a month-to-month, all he has to give you is 30 day notice to move, and vise versa.

Unfortunetly, it is his house, and he can ask you to leave if he wants.
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Unfortunately you do not have a signed lease, so you are considered month-to-month and your LL has every right to give you 30 days notice.

That really stinks, but it is the law.
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Most leases state that they renew their terms on a monthly basis after they expire, so long as a new lease is not signed.

Even if they don't explicitly say that, a lot of states will consider it there, unless the landlord has implicitly allowed changes to the terms; for example, the lease does not renew itself, and it says "NO CATS". A day after it expires, you get a cat. The landlord knows this, and does nothing to enforce it for several months. At that point, the landlord would have to re-establish the NO CATS clause by posting a 30 day notice on your door saying that cats are now explicitly not allowed.

Overall, I'd say you should abide by the terms in the old lease while you look for a new place. No sense in upsetting a landlord right before they are supposed to return your deposit.