So far we have never had to lower rents a single time but in fairness I started buying in 2011 so the market hasn't been going down during that time frame.  

If I negotiate seller financing, I am afraid to get into an agreement with any kind of balloon payment (just because it makes me nervous to have it hanging over my head) but I would like to negotiate a lower percentage downpayment than 20% so that I could afford to purchase all four (rather than two) under a warranty deed contract.

I once took over an apartment building that was managed by a somewhat large property management company and they had a "national rate" (even though they aren't national) that was far lower than what I pay. 

I will soon own a former chiropractic clinic that as the potential to have 7 or 8 bedrooms plus a 2 bedroom apartment on the lower level.

I'm not sure where you are located or what other flips in the area look like, but cutting costs/corners in kitchens and bathrooms usually means lower profits.

Down the road the asset class may change as I build up some equity/capital, but I'll likely get my start in the lower priced B-/C type properties.

I am in Harris County Texas, more specifically the city of Katy,TX where public works, school districts and such are part of the tax bill PLUS additional fraction of a percent directly to the city.The appraisal district has a particular portfolio of properties all assessed at significantly lower than what like property potentially would be valued at.

@Sergio Moreno Have you talk with your lender if you refinance would you get lower MI and lower interest rate? 

When I was very young, he use to buy homes and resell them to his 13 children at a lower cost.

The property seems to cater to the lower end of the market but attracts some doctors, social workers, and related and unrelated types of businesses.