So I have a vacant commercial space that's part of a mixed use building in San Mateo, CA.

Even lately, real estate can fall, according to this graph. https://inflationdata.com/articles/wp-content/uploads/2013/06/Housing-Prices3.jpgThe fact that you' re offering help finding a house to buy seems to indicate mixed incentives for your advice.

So I’m looking to purchase a mixed-use property.

As as section 8 it’s a mixed bag.  

Stoves and basements don’t mix very well without proper ventilation and fire precautions.

In summary, the required ingredients for a "collapse" are just not present in the mix, recession yes but the talk is collapse. 

I have a UV light and it gets mixed results.

However, some of the reviews i've heard from other fellow contractors on china made cabinets have been mixed but it seems to be a general consensus not to go with the cheapest cabinets.Again, feel free to pm me and send me pictures of the kitchen and id be happy to discuss further in detail to help you out. 

I have been using rentometer in parallel with Zillow and MLS data to get my rental comps but didn't think to use it for 1 bedroom comps, that a good idea.My area has a healthy mix of both state and community colleges which could provide the benefit of demand for single room rentals from an audience that is already used to sharing common spaces so definitely worth looking into.

As for my next purchase, I am going to try and use some equity mixed with savings from no longer having a rent payment.