Gift of foreign rental property - adjusted basis and depreciation

I received as a gift a rental property in another country.  I know I need to report it on Forum 3250.  I also know that I need to report rental income on Schedule E.  The question is, what is the basis for depreciation.

 

Let’s say the original purchase price 20 years ago was $100,000 + $20,000 for land.

 

Based on my research, the tax authorities in the country where the property (and original owner) is allow a depreciation of 2% annually over 50 years.  I believe (need to confirm with old records) that this happened, so $2,000 were depreciated each year for 20 years.

 

If the depreciation happened, is it correct that my adjusted basis is $100,000 - ($2,000 * 20) = $60,000?

 

And do I then just depreciate those $60,000 over 30 years, or do the 20 years of foreign depreciation reduce the length of time for me?

 

Also, if I cannot confirm that the depreciation happened abroad, do I then use the original purchase price as basis?