Things can be delayed but quality triple net deals are in short supply so he might lose out on what he finds if he has to wait to close on the sale of three separate properties.In reality, you are offering him a great opportunity if he truly wants to sell the properties and do a 1031 exchange for them all. 

Why don't you meet a bunch of wholesalers to supply toy properties .

I dont know this for fact, but at the very least I would think the new GC would have to supply insurance info and licensure to L&I before anything is swapped.

I really like syndication for geographic and niche diversification if you also like to venture into other areas besides MF apts, but maybe self storage and mobile home parks that have good demographic and supply/demand trends playing into their favor and throw off a lot of cash.  

m=9&y=17&utm_source=HAR%2FMLS+Master+List&utm_campaign=37e6c93251-January+2017+MLS+Release&utm_medium=email&utm_term=0_5c0a7c027d-37e6c93251-252424337Houston Real Estate Highlights in August, 2017: Hurricane Harvey ended ten consecutive months of positive single-family home sales, as volume plunged 25.4 percent year-over-year with 5,917 units sold;Despite Harvey’s rampage, single-family home sales remain 1.8 percent ahead of the 2016 volume on a year-to-date basis;Total property sales dropped 24.2 percent with 7,077 units sold;Total dollar volume fell 22.2 percent to $2.0 billion;The single-family home median price rose 3.0 percent to $231,700;The single-family home average price increased 2.6 percent to $296,418;Single-family homes months of inventory grew to a 4.4-months supply, but is expected to shrink with strong consumer demand for housing in the wake of Harvey;Townhome/condominium sales dropped 31.4 percent, with the average price down 1.1 percent to $196,230 and the median price up 2.0 percent to $159,000;Leases of single-family homes rose 9.4 percent with average rent unchanged at $1,857;Volume of townhome/condominium leases jumped 17.0 percent with average rent down 2.2 percent to $1,551;HAR continues to encourage anyone who has housing available for temporary occupancy (up to 12 weeks) to please post it on our Harvey Temporary Housing page as soon as possible at www.har.com/temporaryhousing to provide housing to those in need.

For AC, you need separate ductwork for supplies and returns between the units, separate blowers, and you also need separate cooling systems - condenser and coiling coil; you might be able to use mini-split units to achieve that.For hot water, you need the piping separate for the hot water, and then you will need multiple water heat sources with one per unit.

The housing supply in the Triangle market does not meet the demand.

In CA hot weather the pool was once a nice feature when water supply was a limit. 

Has anyone ever compared such figures with actual ones supplied by a realtor?

It runs to the Unit above and is a relic from the past; it would have been used to supply gas lights.