The HVAC and water heater estimated to be 6 to 8 years old by the inspector.

I do not unless it is an emergency so the pipe bursting recently was flooding their home and unfortunately they didnt know how to turn the water off regardless that I told them how before etc! 

I can tell you these facts:SFH lots of times do not qualify for max cash out options b/c the rent can'y support the max loan payment.2 - 4 unit houses always have a 1.5+ DSCR and never have a problem affording the max cashout...STR rental structures blow LTR rental structures out of the water. 

It’s also water-resistant, making it great for any spills or moisture issues.

It includes high-efficiency HVAC systems, contemporary LED light fixtures and multiple tankless water heaters.

I already owned a home not on the water.

If I was the tenant that got damage from another tenant's water heater, I would expect him to pay the bill.If it was a pipe in the building and not in their unit, then I would think the landlord would be responsible.

The character of a wo/man shows when the ship is taking on water.

Test the waters with the sponsor for 3-5 years as they hold the properties in the DST, then decide if you want to align with them as a part of your long estate plan.Last (and best) recommendation: Ask your broker what the funds from operations (FFO) ratio is.

things missing in your list (everyone manages differently, so take it with a grain of salt)Vacancy rateTurn overbad debt legal fees (evictions as needed)accounting fees for professional tax prepmaintenanceProperty TaxesSales Tax on PM fees (In NM, this is charged, not sure about where you are)Reserves for replacement CAPEX - furnace, water heaters, ac, roof, parking lot, etc.Admin, software, advertising, etc.Cost segregation study for accelerated depreciation captureAs for your loan.