I would advise against using a sole practitioner for continuity purposes.

Getting 25% down and 4.0% rate seems optimistic for the tenant base you are describing.That's more for Aspen Dental, T-mobile, Starbucks with brand new 10 year leases and strong guarantor companies.

There's no retirement matching fund, no dental, vision, or other types of "plans", so be ready to pay for all of that out of pocket. 

By career I am a Nurse Practitioner and a Reservist.

Either way, special purpose building, they’re not going to rent out tomorrow to a law office or dental practice… Get a contact who will pull title for you, check the last date and the amount of the most recent financial transaction there was on the property.

I am hoping to find other dentists in the area who also invests in RE in order to discuss strategies, goals, and how to balance RE investing with a dental career. 

You or your accountant will decide if you should file using the standard deduction or itemized deduction.Typically you or your accountant will decide what deduction option will save you more in taxes.The standard deduction are the following:$12,550 for single filers$12,550 for married couples filing separately$18,800 for heads of households$25,100 for married couples filing jointlyCost that can be used for itemized deductions:Real estate taxesPersonal property taxesMortgage interestStudent loan interestGifts to charityPossibly medical and dental expensesThe mortgage interest deduction is a tax incentive for homeowners.

I know you want to help your friend, but do yourself and them a favor by not breaking the law and doing things as an unlicensed practitioner.

Conferences offer a great opportunity to meet a broad mix of practitioners.

Sure, but factor in that I take them to and from school every day, can't even claim them as dependents on my taxes, provide full medical, dental and vision coverage.. and they stay at my house overnight 50% of the time, and I'm probably paying too much.