At the same time, this completely addresses the OP comments regarding what is and isn't allowed on BP.

Ever hear what a grow op does to a house?

I am happy the OP poised this thread in the manner in which they did.  

Well, seeing as the OP has had 6 years to figure it out, hopefully the drain is unclogged by now... ;-)

I didn't read everyone's response because I found the OP missing a little in concept and information.A Seller willing to carry a note for $20k is not the same as the Seller will accept $20k for said note for the complete sale.  

Then would do the reverse post Winter and check the condition of the window and door screens as well.The elf would call each tenant to negotiate a good time for the on-site maintenance inspections, set the appointments, and post a legal "Notice to Enter" if necessary.At our 8-plex, once a week, the elf would clean the coin-op laundry room and wipe down the w/d machines, walk the premises to check on the tidiness of the grounds, check on the proper use of our garbage dumpster/recycle bins, and water the flower beds, shrubs and landscaping as needed.I would reserve my time and expertise for business financials, for nurturing the tenant-landlord relationship, and also for tenant move-ins and move-outs: advertising, screening, interviewing, showing, contracting, new tenant orientation, etc.

If the OP legitimately moves to a different state due to a job change and his income/credit/debt ratio supports the loan he can have multiple fha loans

I really appreciate the honest and transparency of the OP here.

The OP explains that Fannie Mae has separate underwriting criteria for your first 4 ("DU Pure") and for the remaining 5 through 10 ("Multiple Financed Properties").

Most of the discussion seems to have centered around the psychology of the deal, as I believe that is what most people believe the OP was asking.