Here's info on the Burlington, Vermont community land trust. I haven't had time to wade through it yet, but did note that the trust retains a repurchase option as an affordability guarantee. Also, the lessee promises to live on the property at least six months a year.
Here are some Burlington land trust homes for sale.
Here's the federal definition of Community Land Trusts.
Here's an overview of HB 525, Eddie Rodriguez's Homestead Preservation Act.
Two more. The text of HB 525, which took effect last year.