Additionally, my area has an abundance of 4-family properties in those in-between areas where a would-be house hacker can benefit from the four rental income streams (instead of just two if they bought a duplex) in order to help stay within the DTI requirements. 

Should I agree to this so I can make some additional income, or is this opening a can of worms that I don't want to open? 

Assuming I could qualify financially (primary income plus FHA allowed rental income contribution from additional leased units), when I become the owner of the property, would that prevent me from using a FHA 203b to house hack a second property?

Keep in mind that any traditional lender will have rules and limits for how much the seller can finance in addition to their own loan, so unfortunately it's not possible to combine the two for 100% financing or anything close.John

This could be through finding ways to increase the rent on your existing properties, taking on additional work, or finding other income streams.Reducing your current debt levels can also improve your DTI ratio.Improve Your Credit Score.Look into various financial institutions, including community banks, credit unions, and online lenders, which may have different criteria or offer programs for investors.Since portfolio lenders retain their loans in their own portfolios rather than selling them on the secondary market, they are able to provide greater flexibility.

. ;) In addition, you may close on a lease/rental, you usually get commission in the entire lease term.

But in addition to my comment above: yes if the focus is more on a "buy and hold approach" where you are looking for cash flow and assuming you have gotten some super amazing loan product where you can actually obtain some each month...

In addition to identifying owner-financed homes, they can negotiate better interest rates and terms with the seller and assist you in completing the transaction.

Additionally, your wife's citizenship status should not impact your qualification for the exemption as long as she is a resident alien with a valid Social Security number.

@Costin I.Here's an article with additional FAQs on cost segregation studies that you may find helpful:https://www.biggerpockets.com/forums/51/topics/1113749-cost-segregation-faqAs Michael mentioned, you need to use your cost basis in the property for a cost segregation study.