Purchasing multifamily with a tenant - Contract Questions

[Jason DeMauro]

I am purchasing my first multifamily property, small two-family with one unit currently occupied. The tenant has been in the home for 3 years and wishes to stay.  At this time, I have no intention of requesting the unit be vacated at sale. 

For due diligence sake, I am requesting current lease agreement, transfer of security deposit, history of payments and maintenance requests. 

Is there anything else that I should be asking for? Or, language that I should consider placing in the contract?