State law applies here too. Where both cover a rental, the stricter city rule usually wins; each rule below says so.
San Diego lawIn force
Prohibition of Anti-Competitive Automated Rent Price-Fixing
Can landlords use software to set my rent?
Not with rivals' private data; that's banned.
Landlords can't share private rent data through an app to set prices.
Who it covers
Exemptions: Excludes software publishing reports from aggregated historical nonpublic data over 90 days old or public information without recommending rents, and software used to set rents/income limits under affordable housing program guidelines.
In force since
Jun 2025
The law, word for word
“It is unlawful for a landlord to use an algorithmic device to set rental rates
or occupancy levels for residential rental property …”
San Diego Mun. Code §§ 98.1101-98.1104 · sandiego.gov · Retrieved Oct 1, 2026
Quote checked word for word
California lawIn force
AB 325 / SB 763 – Common pricing algorithm prohibition (Cartwright Act)
Can landlords use software to set my rent?
Not as part of price-fixing between landlords.
Using a shared pricing tool to collude, or pushing others to use its prices, is illegal.
Who it covers
Covers: Any person using or distributing a common pricing algorithm; not limited to housing; excludes end consumers.
In force since
Jan 1, 2026
Enacted
Oct 6, 2025
The law, word for word
“It shall be unlawful for a person to use or distribute a common pricing algorithm as part of a contract, combination in the form of a trust, or conspiracy to restrain trade or commerce in violation of this chapter …”