What to do with $450,000

[Ben Singh]

I am investing $450,000 for my father. He wants income & is happy with a 6%-8% return.
He only wants newer real estate (-7 years) be it a SFR or condo's. They have to be in our general area.
He is open to financing the purchases which will allow us to buy more units. There in lies my question.
Should I buy one SFR or multiple condos?? or a combo? They all seem to have returns in the 6% range.