That is highly dependent on the quality of renter and quality of your property. One of the key values of having multiple rental is the economies of scale, for example:

* Property advertisement - Preparing material and advertising for 1 property can be more expensive than multiple properties

* Material for fixes - Purchasing material for 1 property can be more expensive than multiple properties

* Vacancy - The cost of vacancy for a single rental is higher than having multiple rentals. The other rentals may off-set the cost of the vacancy lot for a period, without requiring external cash flow.

* Experience - Multiple properties will give you the opportunity to experience different issues and allow you to take proactive steps to diminish certain risks.