rental deprecation

 

I was living in a house that I bought 35 years ago for $135K.  Fifteen years ago I bought out my spouse’s share of the home for $89K, which was paid directly to her during the refinance and then the house was place in a sole and separate property trust.  Over the last 15 years may improvement have been made to the home.  That same house would sell on the market today for around $500K.  In November I decided to rent this house and move into a smaller place where I pay rent

 

My question is, how do I value the house for depreciation?