Plus, my complex had 4 pools, 4 hot tubs, a gym/sauna, and security onsite that kept and held packages. 

That was the biggest reason of how I was able to get a package deal closed at $790,000 that appraised as is at $1,265,000.  

Eventually I’ll sell as a package.

Several third-party software developers make such add-on/plug-in packages for Excel.EDIT: Be wary of any potential analyst doing this without using some type of Monte Carlo simulation or similar technique.

I understand that with a typical FHA loan, only up to a 4 Br can be purchased though in this posting it says two building are "included in a package".

was it a package deal with the house?

Waiting for the delivery of my package which should be here by the 8th.

This is correct, OP.If you want them both then you can certainly negotiate them as a package, but the residential lender will want two purchase contracts, two appraisals, two escrows, etc etc.

I'm selling a package of 8 duplexes.

Put together a package on your business strategy and any experience you have and a lending packet on the property.