Hi Jeff,
I've done something similar to what you're talking about. Started with a small office space, originally purchased as an office for my company. When we outgrew it, rented it out and bought a bigger one and moved our offices there. The larger building houses my business and we also rent space in it to others.
The office market has definitely taken a hit in the last few months. I think what's to come is yet to be determined. I see some local economists saying it's going to recover quickly, my gut says we're not going to be so lucky. Not that office space will necessarily sit vacant, but market rates might drop significantly making it an undesirable purchase.
The commercial properties I've looked at in Austin over the last few years have not excited me. Without buying to house one of my businesses, which enables me to justify value differently, makes it really hard to make the numbers make sense when you talk about purchase price + property taxes vs. rental rates.
So what to buy? Personally, I've moved outside of Austin for commercial. I've invested in a property in SA that was purchased by the anchor tenant, I'm under contract on organic farmland that is being purchased for a farmer to rent back from us to grow crops, I'm looking at some land development deals, and of course I'm still doing spec residential new builds (which is my bread and butter).
Happy to discuss if you ever want my input. You know where to find me.