Tenants sounds good, but can be a toxic problem as I recall before of one studying Religion and Ministry somewhere and claimed to be clean and laid back, but came to light by another tenant he stayed with to have a bad temper, bad attitude and never clean up his own dishes and have his stuff scattered in living room without first discussing with his roommate and always asked other roomie for rides and money as a moocher and would get pushy if his roomie refused as unable to at times.
Borrowing could be a key element in this method. Say you borrow $200,000 and put in $50,000 of your own to buy a property for $250,000. Then you develop the property and sell it for $400,000. The property has increased in value by 60% but your $50,000 has now grown fourfold to $200,000. You have to select the right properties in the right areas and develop them wisely.