Every time I called the person that I am talking to all he said is he send another email inquiring about the loan package, then we wait again.

Can I use a commercial purchase agreement to buy a package of single family houses, or will I need to fill out a purchase agreement for each house? 

Make it part of a package.

I'm currently looking at a package deal on a SFH and a duplex as one purchase. 

Right hand side there is lease agreement package.

@Sean D -- Years ago, when I purchased properties directly from home owners, my team had a referral package to hand people. 

None of his ideas are revolutionary: they're just cutely packaged and mildly entertaining.You can find a lot better, more-specific info and inspiration listening to podcasts on on BP.  

@Eric Jensen Banks can be a great resource if you package the deal correctly and are a good candidate for a loan meaning strong financials and solid track record.

. :)I worked with an investor that sold low performing property in Colorado and "traded in" for three cash-flowing SFHs in OKC, but there are other investors that sell packages of 50 super cheap houses to exchange for an apartment building. 

And presented that package to our local commercial bank..