No, you can own as many buy to let properties as you like (or can afford); it’s the number of buy to let mortgages that causes a problem. In general, the mainstream buy to let lenders limit borrowers to either a certain number of BTL mortgages or a maximum amount of borrowing. They do this to limit their exposure to risk on property. The more buy to let mortgages you take on, the narrower your choice of lender. Most landlords used specialist buy to let mortgage brokers to help them source finance, so please do get in touch if you need help.