While working, I shifted my focus and started doing BRRRR projects on the side while maintaining my 9-5 job.

As long as you and your CPA maintain thorough and accurate records, you should be in good shape.

I am a full time real estate professional and my spouse as a state employee W2 paid job.

How do you find contacts, reach out, market and then maintain your relationship with them?

Most prospective guests can indeed see through an overly picky critique.However, there are ways to respond to critical reviews that maintain professionalism and avoid coming off as defensive:Keep it Short and Professional: A brief, polite response shows that you care without getting into the details.

The reason behind that is simple: maintaining infrastructure for low density single family housing is cost prohibitive. 

I currently am a part-time real estate investor that will be leaving my sales job at the end of the year to start investing full time in real estate.

Purchase price maybe $120,000  a door, that seems high to me for 70s product, but I just don´t remember prices at that time.   Rents

Present yourself as the profesional with high end software and should help to maintain your growth going forward.

Tenant risk is lease term remaining, sales/billings from the location, overall financial health of the tenant (i.e. solo practitioner with this one center as their sole source of income and declining billings, will not likely keep the property well maintained, and when they move out, you will have work to do), need for this use and/or competitive urgent cares in area, etc.