What does ISAOA/ATIMA mean?

ISAOA/ATIMA means "its successors and/or assigns as their interests may appear". This term is commonly used on the mortgagee clause by lenders.

For example, here is the mortgagee clause for one of the properties in OfferMarket's single family rental portfolio insured through Steadily Insurance:

American Heritage Lending LLC ISAOA/ATIMA
485 E. 17th Street, STE 220
Costa Mesa, CA 92627