This is the biggest house I’ve flipped so far.the other two were about 1800 ft.² single-story homes.As far as ADU goes, I have already passed framing, electrical, plumbing, insulation, sheer wall, and HVAC and installed all windows & door.

She might not be understanding something or explaining it to officials properly and that is where an estate attorney can help.

If you want to go a step above you can pay for an installed security system.

However, when I submitted paperwork for my first loan draw, the lender requested permits not only for the roof but also for the significant interior work underway, such as HVAC installations.

But, if all you have is a tax certificate, you MUST prove the tax sale was done properly, even if the other side does not raise that issue.

The key is doing a proper screening.

If the lock is lot aligned properly it will "jam" alot. 

I'd just send them a move out list of what they need to do and if your lease states that you can show the place (with proper notice), I'd remind them of that and try to book showings as close together as possible to minimize the disturbance to the tenants. 

We then spent around $30,000 out of pocket on renovations, including repairing the roof, upgrading the electric panel, installing new HVAC, and putting in a new kitchen.After completing the work, we refinanced with LendingOne using a 30-year fixed-rate DSCR product at around 7%, which resulted in a net cash-out of approximately $15,000.A couple of things to note:I'm out of pocket on this property for around $40,000 ($25k down, $30k rehab, minus $15k recaptured).I'm thrilled with this amount since it's far less than our "normal" 25% down strategy would require based on the higher value.The property appraised for $330,000 after the renovations.The key point for me is that this property is now netting around $800/month in cash flow.

@Greg DevlinIf you go the passive investment route, you may check out this website that has a database of Opportunity Funds:https://opportunitydb.com/funds/If you do your own project, just make sure you have proper advice and planning before you make any purchase or investment.