But rather a sliding scale based on total income of both parents, and percentage of the total each parent puts in to the total, and how much of that amount should be spent on the child.

A 10% increase in rents could easily equate to a 15-20% increase in NOI at that scale, which equates to a 15-20% increase in value (at a constant cap rate);- It's difficult to park tens of millions of dollars someplace that will earn much greater than 7% passive returns, and it's REALLY difficult to park tens of millions of dollars someplace that will return 7% with a very real chance at appreciation.

I have worked with developers wanting to purchase land and build 250 to 350 units over 3 years broken into 3 phases of construction.Projects of that scale are about supply and demand and timing the market.What is your goal with building the 4 unit??

So why not break the profit down with him and show him he can make money at 12%.For the first deal, if he has cash, he should use cash and not try to scale his business.

Sold less than a year later (by a few weeks) for $1.5 mil which was list price.I have not since done a project with such a high cost and need for "luxury" but that was my best deal because it was a huge risk that paid off in the end and gave me the confidence to scale up my business and career with the proceeds earned.

I believe the best reason is economies of scale which is incorporated into several aspects of aprtment buildings such as:Management, repairs/maintenance, loan (one loan, multiple doors), utilities, etc.Also, if you lose 3 tenants in a 50 unit building, you just lost only 6% of your tenants, if you lose just one in an SFR, you are 100% vacant.The second best reason is forced appreciation.

I don't think anyone is going to have good data to prove anything on a national scale.

However, they also have economies of scale where SFR's do not.

Although a 10 unit seems large, it is very small on a commercial scale.

I would agree that they have a lot of advantages, but they also don't come with the economies of scale that an apartment offers.