I don’t know whats going on in these particular zip copes. However, one theory behind dropping inventory is that a large percentage of homes were on the market last year by owners testing the market; unmotivated sellers looking to cash out for the right price.
Many of these people have taken their homes off the market and waiting for a rebound.
Thats one theory anyhow, and I’ve seen a lot of it in my neighborhood (North Park). But if anyone has a better explanation I’d love to hear it.