Purchasing a triplex with tenants... What do I ask for?

[Thomas Turano]

Total newbie in the process of purchasing a 3 unit property (one duplex and one single family home on the same lot) in Florida. Each unit comes with long term tenants, one being there for over 13 years. 

I'm wondering if anyone has recommendations on what to include in the buying contract. Right now I have things like, seller to provide signed leases, signed documentation from tenants outlining condition of their units, and security deposits. 

Am I missing anything?