If they are a dentist, chiropractor, electrician, baker, hair salon or anything that requires a building, buy and sell or lease to them. 

How's it going, I am a dentist working in Boston, MA with a decent amount of book knowledge in REI.

B buy a building with your credit, get a mixed use approved. don't improve 7000 sq ft as a tenant. all the rich guys are owning real estate. negotiate with yourself market rent and multiple tenants. occupy less than 25%. look at land. don't do this. 7300 sq ft is crazy to build out for a dental practice. get a few other dentists to split the cost with you and do a sale leaseback, you can probably sell the building and roll the business up to a private reit attach real estate to it. 

Dentist, Chiro, dance class, TKD,  Market to those.  

This home was actually rented by a dentist prior to us buying it but it does not rent out for enough if you do it long term as a single unit for us to afford the next home.

Grocery stores, doctors offices, dentists, locally owned shops, higher paying jobs but also just more jobs themselves, restaurants, etc...  

I hate getting birthday cards from my dentist.

Everyone get concierge service...check cashing, flat tires fixed, trip to and from a dentist, loan-a-tool, jump start a dead battery, etc. 

What Bob said above is what most of our clients do through us.And while the desired income level varies, the goal we map out seems to be 5-7 years typically until they've met it.We have a dentist in CO we're working with to map out an aggressive 5 year strategy (starting with more liquid cash) and jumping into a few 4 unit buildings as well as SFR.  

We own one dentists office and get really good rent on that but the space does not lend itself to medical offices.