As I am neither a US citizen nor a resident, I would like to know which taxes I need to pay and which rules I need to follow.

To avoid this, you can first go to Opt Out Link, scroll down to “Electronic Opt Out for 5 Years”, complete the form, and submit.

It has specifically banned STRs of secondary suites, though renting out primary residences or rooms within them is still allowed, subject to licensing fees and a nightly tax. 

(Of course there are sales costs, tax implications, etc).Thanks!

HELOCS do exist for rental properties but you are usually capped at 65-70ltv and these will most likely require a full underwrite that takes into consideration taxes, income, dti and all the normal quasi-associated red tape.

Can anyone recommend a great accountant they've worked with who also has experience with US Expats living abroad filing their taxes back in the US?  

Year 1, cash on cash return at 9.46% Over the next 10 years, here are the projected overall returns with 5% year over year rent growth, 3% year over year appreciation of the property, and calculations for tax savings + debt pay down: I'm a buy and hold investor.

This involves discussing legal and tax implications with professionals like a real estate attorney and tax advisor to find the best structure for your situation.

This seems like a waste of the very advantageous LTCG tax bracket (I'm not concerned with state tax). 

Do you have any interest in 2-4 units to increase the units/rents under one tax bill.