If you're looking at a debt service loan, 15% is the minimum for a purchase but it's much more common (and rates are better) at 20-25%. 

A multi-unit property was purchased for $140k. 

Purchase price: $115 Cash invested: $17,000 This is my first fix and flip.

Quote from @Dennis McNeely: In a sandwich lease option, the investor exercises their option with the property owner to purchase the property when the tenant-buyer indicates they're ready to exercise their option and purchases the property.

Purchase price: $252,000 Cash invested: $63,600First buy and hold.

@Moshe MarcianoI recently helped an investor from Orange County purchase a single family home here in San Diego.

You want to look at paragraph 12 of the Texas purchase contract, called the 'One to Four Family Residential Contract'.

With a purchase price of $250k, your rent is WAY too low!

We managed over half of the purchase price in cash and then the remainder was held as a 3 year seller's note.

Purchase price: $600,000 Cash invested: $30,000 Purchased single family home, finished basement making the property a duplex.