Financing for a Seller of 5 properties

[Thomas Elijah III]

I have a seller with many properties. The seller wants out of the low-income rental business because the business is disturbing his lifestyle.

The seller is willing to provide financing, yet, wants assurance if vacancies occur seller still receives monthly payments because seller doesn't want back in the business.  I am not flushed with cash! 

Are there any mortgage insurance policies available?  I need so expert advice/ideas before I approach the seller again.  Gotta make the deal stick!

Thank you for your help in this matter. Happy New Year!