Wholesaling a Multi-Family?

[Bryan Dracka]

In my most recent mailing a multi-family got mixed in with my sfr's and I got a call from a the owner asking how I knew that she "was planning to sell". The owner is retiring and moving out of state soon. Its a 3-unit in a residential sub in Lincoln Park Michigan (Metro Detroit). Each unit is currently rented for $500.

I have never wholesaled a multi-family property before. How do I price it??

Any input would be greatly appreciated, this seller is what I would consider highly motivated!