Depreciation for buy and hold

[Scott Ball]

I need a bit of clarification on depreciation since where I live overseas they calculate it completely differently. 

My understanding so far is that you can start depreciating your property once it is rented and you can fully depreciate it over 27.5 years. And it's only based on the property, not land value. Assuming I am not depreciating the chattels or heater, etc. just the building on a buy and hold.

If I buy a property for $110k this year, and land component is $10k, I can depreciate the $100k as mentioned above. 

1) If I sell in 20 years to another investor for $220k and the land is now $20k, their cost base for depreciation is now $200k and they also have full 27.5 years?  Does it ever end? If every 20 years a new person sells can this keep going forever?

2) If I sell for $220k in 20 years and then do a 1031, and buy a new property, does my new property I have a new 27.5 years to depreciate or am i somehow limited based on the first purchase?

Thanks!