From tax stand point I would think you can separate from primary and be okay with IRS being that IRS will not be local code enforcement.  

There may be something called a "Due On Sale" clause.Check and see if all tax parcels are included in one mortgage or if they have separate mortgages.You have to have him spell out what he considers to be a "partial seller financing".

BRRRR, Fix Flip, taxes, deal analysis, market analysis, marketing, financing, etc.  

Low barrier to entry, low taxes, landlord friendly, some amazing class A and B suburbs and a strong urban core. 

I've spent aproximatly 61.5K on expenses over the years, Interest, Property Tax, Isurance, HOA and various repairs and upgrades.

Yes, this is an unsexy option and it doesn't offer the same tax benefits, but you would benefit from reduced volatility (so long as you don't obsess over fluctuating stock prices), greater liquidity, stronger management teams and superior assets.

- The percentage difference is the percentage the taxes will go up after you buy it.What do you mean by the property has HVAC AND boilers? 

You want an investment that pays for itself, including mortgage, taxes, insurance, maintenance, and even some money set aside for a reserve to cover vacancies and capital expenditures.

I would also share pros and cons of paying taxes on the windfall versus owner carry.

No management costs as it would be self managed, and estimated property taxes by the average of the past few years.