I would if you plan to sell it at or before retiring. However, if you plan to keep it and live off the cashflow, then I would only count the cashflow as an additional income stream.
It's similar to a situation where you own your primary residence, but you plan to sell and rent in retirement. In that case, you would count it toward retirement savings. But if you're of the mindset that you're going to live in your home until you die, then you wouldn't count your primary residence towards your retirement savings.