If you’ve hunted for apartments recently and felt like all the rents were equally high, you’re not crazy: Many landlords now use a single company’s software — which uses an algorithm based on proprietary lease information — to help set rent prices.

Federal prosecutors say the practice amounts to “an unlawful information-sharing scheme,” and some lawmakers throughout California are moving to curb it. San Diego’s city council president is the latest to do so, proposing a ban that would prevent local apartment owners from using the pricing service, which he maintains is driving up housing costs.