There are various other items that may come up such as: Proper firewall suppression, adequate entrances/exits for fire safety, stair safety, size of kitchen appliances, etc... for my specific example. 

If the property is making money - and I mean really generating good cash flow - then those taxes are just another line item in your budget.

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.

It is an item of MAKING MONEY and NOT of producing, transporting or bring to market any goods or services at all.

Now, I typically only use them to skim stats on reviews and the more basic items. 

they look like they'll cash flow a few hundred dollars a month but then you have a rough tenant turnover, or a big capex item come up, and boom - your cash flow is gone for 5 or 10 years.here are two really good threads to read.Overleveraging, net worth, cash flow and headache factorBaltimore - a path to never-ending painhappy to help further.

The biggest advantage of using someone local to where you're buying is that they will understand taxes, insurance, and similar items very well when it comes to DTI/DSCR calculations and payment quotes, and they will likely have a local network of service providers for ancillary services (survey, inspections, etc).

It is just a matter of whether they broke it or not.It goes the same with all issues such as guest complaining about not being able to check in before check in time, or not able to find the item when we clearly stated where they are and sent them photo proof… I call this stacking the bullets before the battle and I tell my team you guys are sending me without weapon to fight if you don’t do this for me 😂 (I handle all the claims as I do this for my job)You are in an expensive market!

Depending how long your LTR was in there, you might need to fix or update a few items. 

Your biggest problems here are going to be how to properly qualify someone, what to do if someone stops paying, footing the bill if you have a big repair item, finding quality and reasonable vendors/contractors to fix things, and keeping track of payments.If this isn't you, give me some more context of where you're at and I can give some better insights.