I’m a realtor up towards Collin county (Plano, McKinney, Frisco, Allen).

I know a great realtor who is in Plano.

Plano TX.

One was a house in Plano we planned to wholesale for a pretty nice fee.

I own a house in Plano, TX my own) and a rental house in Garland, TX.

How long will the boom in North Dallas suburbs (Plano, Frisco, McKinney) last?

Initially, I was looking at Frisco and Plano areas but not able to find any property in my budget (~250K) that satisfies the 1% rent rule. 

We currently live in an apartment in the Plano area.

A commission listed on the MLS plano is for MLS members only (not alot of people know that because listing agents choose to pay a co-broke without checking the other agent's status).If you have a separate commission agreement (which obviously you would have to call something else because you can not make a commission as an unlicensed person), you would need to make it a part of the contract by mentioning it as Addenda within the contract. 

I just to plan for real estate investing, and already used some of real estate investing calculator for cash on cash calculation.I’m looking on long term investment and perhaps as a resource for retirement in next 20 years.My main concern is considering current market and houses I picked in Frisco and Plano TX most of them gave me negative cashflow for 7 years and then start to pick it up.