Selling the house does not by itself end the agreement between landlord and tenant. Keep the lease and deposit records together. A recorded lease can bind a buyer, but the buyer does not automatically assume all of the seller’s personal lease obligations; the rights and obligations need to be addressed at closing.
If you plan to end a month-to-month tenancy, Louisiana’s basic notice rule is at least ten calendar days before the end of the month. For a residential house, the notice must be in writing. The lease and other applicable protections can affect the answer. This basic rule is not a move-out date for every lease or situation.
A sale alone does not give you possession of an occupied house or make a tenant move. If you are planning for possession, use the actual lease and applicable process; do not treat the sale itself as ending the tenancy.
Have the deposit balance, who holds it, and the related lease records ready so the closing attorney can arrange the transfer correctly. Put the deposit handling and any related responsibilities into the written closing details rather than assuming the sale automatically transfers every personal lease obligation.