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Good afternoon. If the seller doesn't leave voluntarily, then you are going to be required to go through the formal eviction
process which can take a month or two to get the seller out. You would not be required to give the 30 day notice, because if he breached your agreement to leave by a certain date, he would be in default and thus you could bypass the 30 day notice. But, you would have to give him first a 5-Day notice to Quit...meaning he has 5 days to leave and if he doesn't you would then need to file an eviction petition with the court to get a court order to force him out. To avoid this, prior to closing, you should require the seller to deposit a certain amount of the purchase price in escrow
to insure that he leave timely...the amount should be sufficient to insure that it's more painful to stay than to leave.. and if he fails to leave timely, he forfeits that escrow amount. Otherwise, let the seller know he has no right to extend the closing and no right to stay in the property and if he fails to close timely and leave timely, you will file suit for actual and punitive damages
due to his default.
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