Off-market Commercial Properties?

[Akshay Bhaskaran]

Me and my wife are Residential Real Estate Investors for the past couple years. We have couple turnkeys, and couple of BRRRs that we did so far (all are single family residential properties with long-term tenants).

We are interested in exploring commercial real estate, and wanted to get all of your help in getting started. 

Some basic questions to start with:
1. Is there something like off-market commercial deals where I can search them (like Investorlift or New Western for residential) ? 
2. I did check Loopnet and it's all listed for sale by brokers and agents, so I don't think it is off-market -- right?

TIA.