Rent payments from the medical LLC are fully deductible as a business expense, while the property-owning LLC will report the rent as taxable income, which can be offset by deductions for expenses like mortgage interest, property taxes, maintenance, and depreciation.To ensure compliance, document how FMV was determined—using market comparisons, an appraisal, or similar data—and draft a formal lease agreement outlining the terms, rent amount, and responsibilities.

They seem to be very expensive and I'm not sure if it's something absolutely necessary or not. 

To make taxes easier we set up a business checking account and had all the rent paid into that account and all the expenses paid out of that account.

Have a plan for marketing, operating expenses, and scaling without overleveraging.

at least they were.. but they are expensive.. they take on maybe 5 to 7 students at a time and charge around 100k each for the year.. 

Admittedly, I am not one that typically finds paid mentorship very valuable, but I also respect that my degree is in business with a focus on real estate, and my first job out of college was in real estate (so it is a little hard for me to take my 20 yrs of knowledge and rewind it to try to view mentors from a completely fresh lens).A couple points: I view mentors, especially these expensive ones as a catch-22. 

Hiring a PM is more expensive than anticipated.

Perhaps you have coverage for the replacement value BUT the insurance company when calculating the replacement property uses modern building materials like drywall but your original house had plaster which is much more expensive.

Real estate investing is forgiving; the average person can still make money even with some big mistakes.

Your market is expensive, I wouldn't look for normal working class people as your target customers.