Why would you? If your home value is going up, your property taxes are mostly static, and rents are high enough to cover your mortgage and then some, there's no

Why would you? If your home value is going up, your property taxes are mostly static, and rents are high enough to cover your mortgage and then some, there's no reason to sell when you can hire a property management company to take care of the place and rent it out. Doubly so if you can use your primary property to help finance a second one elsewhere.