I thought the owner might be interested not only due to the energy savings, but also as an alternative to a very costly window replacement and to achieve higher rents.

Great choice.

Just an example Yesterday, my motivated seller’s earnest money put up in a escrow of my choosing, Today, my cash buyer’s earnest money put up in a escrow as well howeva Its with his own title company which is different from my initial escrow, that I had, So tomorrow how will I transfer escrow funds from my original title company & put those with the cash buyer’s title company of choice?

Probably to be decently profitable we really needed 50 to 100 agents, so 35 was just the minimum to start an office.An alternative for you if you think you are or could be a great recruiter is to join a brokerage like Keller Williams, which will allow you to run your business inside of theirs.   

Alternatively, if you did a Syndication you could learn from the general partners the process and then be a GP on another one and share in the profits and maybe then even 1031 into a large complex of your own.

I wouldn't take on the risk for a 5 or 6% cash on cash return when there are much better alternatives. 

I'm curious to learn more about personal finance choices that BP members have made in addition to owning real estate.

If not, is there a viable alternative to the driveway? 

With such high incomes you may be better off as a group saving to a higher amount, say 40-60k+ each and syndicate a small/medium apartment complex together.Syndicating apartments may be a better alternative for you since you have so many people together as a group. 

(Alternate) -Good Neighbor University: Use all of the accumulated knowledge, guides, and trackers to teach new highschool graduates how to renovate and maintain a home, how to manage the entire accounting process (both personally and the business of their property).