2 - What RE Market data3 - What Demographics4 - This is an after purchase, not a before purchase item.

We will be adding a day light basement to their Studio House plan to capture views of the lake we are building on.

No, you cannot "write off a new truck every 3 years" as those YouTube professors suggest.Prepay or delay personal itemized deductions.

Due to item 1, adding an ADU can require years to start achieving any return (once the accumulated cash flow recovers the initial negative position).4) Adding an ADU is a slow process.

Buyers are Liars"  And I guess the same can be said for sellers to when they do not divulge items they know. 

If you don't want the property any more a 1031 is probably your best bet, unless it's got a huge capital gains capture in which case you could just take your tax lumps and collect your funds. 

So I'm guessing it might depend on your state laws and personal situation. and make sure you know of any sticky items that would eliminate the protection you get from the LLC.

This was a very simple due diligence item that was missed by many people. 2.  

I've been pondering the same question lately.For items like HVAC filters, do you remind tenants when it's the time to change it, or just expect that they will do it?

You can have a box of items that are free for tenants to take/use: toothbrush, toothpaste, charging cables left behind from other guests, sunscreen, unused earplugs, etc.