He tells me that right now his dental office buildings are fully paid off, and he would be willing to lend equity from the buildings to me in order to fund the downpayments for properties.

I’m in Law Enforcement and she a dental hygienist.

I am a dental hygienist, and we are both aspiring real estate investors.Last year, we were hunting for a multifamily property, and put in over 20 offers, none of which were accepted.

Great high level book is "the real estate game" by some guy at Harvard Business School who was a successful practitioner for many years.I would also recommend going through one of the failure or "slap my head" mistake threads together over beers....have fun!

My husband will be graduating dental school this spring.

Once she secures a full time job as a nurse practitioner we will be settling down in one spot and I will keep my license there. 

Very much like a dental office.No surprise you find it most often implementet in Keller Williams - have you spoken with anyone there?

I want to borrow $200-250k and use my debt-free, leased dental office as collateral. 

I'm in an overpriced rural northeast market and waiting for my wife to finish dental school while I'm working remotely.

Dialysis, equipment rental, dental, Chiro, home daycare, health alarm services, etc.