If you have steady rental income gain year over year from your rental properties, your might want to think about reducing the rental income gain. 

You can borrow the equity from the rentals to buy another rental property or to upgrade your primary residence, or to pay down the mortgage on your primary residence. 

This way, your rental gain will be gone, so does the tax.  In the meantime, you are expanding your rental business by acquiring more properties or you are cumulating more equity in your primary residence.  The goal here is to not pay tax or pay as little tax as possible from your rental income.