I am a non resident alien. In 2012, I purchased a condo for 60.6K in Florida and had a property management company rent it out for me. I have filed my returns on form 1040nr with Schedule E since then:
2012 : rental loss (3.2K) including depreciation (1,6K)
2013 : rental loss (4.6K) including depreciation (2.2K)
2014 : rental loss (4.5K) including depreciation (2.2K)

In February 2015, I sold my condo for 72.8K. Prior to the sale, I incurred a rental loss of (0.9K) in 2015.
I understand that I can offset the capital gain (72.8K - 60.6K + 6K = 18.2K) with the passive activity loss.
However, I do not know which form to use. I assume that there should be some computational form, the results of which would populate form 1040nr.
I do not have any other type of income or business in the US.
Any tip would be welcome.