As a buyer of a foreclosed (REO) commercial property, can I start all new leases with current tenants?

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1. What happen to all the tenants and their leases in a foreclosed commercial property? I just want to find out if the leases of a foreclosed commercial property (REO) are still valid and enforceable?...
2. My tenants owed 4 months rent & vacated the property on the court date. How can I get their current address? My previous tenants owed 4 months rent & vacated the property on the court date. They vandalised my property before leaving. They still live in SE London, and I have...
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