I think people would like money but being a landlord in addition to probably being a multi-income household is a lot. A lot can go wrong being a landlord even in a place with permissive laws.
One thing that I think would be interesting would be allowing the sale and transfer of unused development rights (AKA "air rights.") That lets somebody take advantage of the development capacity without the landowner having to make a gamble on what could be a very risky development. A lot of jurisdictions have something like this allowed already but generally limit it to certain districts, or only landmarked properties get to sell development rights like this, or something else.
One thing that I think would be interesting would be allowing the sale and transfer of unused development rights (AKA "air rights.") That lets somebody take advantage of the development capacity without the landowner having to make a gamble on what could be a very risky development. A lot of jurisdictions have something like this allowed already but generally limit it to certain districts, or only landmarked properties get to sell development rights like this, or something else.