@wrojas0 The mortgage or refinance have nothing to do with the gain or loss. If it was always a rental property, you use the purchase price (PLUS cost of improvements).
Because depreciation lowers your Basis (cost), your basis looks like it is about $10,500 ($105,000 minus $94,500), not including improvements. That would give you a gain of $55,500 ($66,000 minus $10,500). All of that would be Unrecaptured Section 1250 gain, and is taxed at your regular tax rate, up to 25% (plus any State taxes).
