About

A serious tool for a serious job.

LandlordOS turns Los Angeles housing ordinances into property-specific compliance actions, required notices, and defensible proof records. The product exists because LA's rules are unusually complex even by California standards, and the existing tools for landlords didn't take that complexity seriously enough.

Why this exists

The problem we're trying to solve.

A Los Angeles landlord with a small portfolio — two units, five units, twenty units — has to track more than twenty separate ordinances at any given time. The Rent Stabilization Ordinance. Just Cause for Eviction. AB 1482. The Right to Counsel posting and service requirements. Annual registration. Capital improvement pass-throughs. Eviction notice protocols. Relocation assistance schedules. The list goes on.

Each ordinance has its own applicability rules, its own forms, its own deadlines, its own proof requirements. Getting any one of them wrong can cost a landlord thousands of dollars in penalties, void an eviction, or expose them to affirmative-defense liability for attorney's fees. The penalty for non-compliance is asymmetric: being almost-right is often legally identical to being wrong.

Most landlords navigate this by guessing, asking other landlords, or paying attorneys $400+ an hour to interpret questions that should have been deterministic. The information exists — it's all in the municipal code, on LAHD's website, in case law — but it's scattered, inconsistently maintained, and not organized around the questions a working landlord actually asks.

LandlordOS is an attempt to build the missing infrastructure: a deterministic engine that takes a property's details and produces the specific compliance requirements that apply, with confidence states that surface uncertainty honestly, and a defensible record of what was done and when.

Posture

What this is, and what it isn't.

We'd rather be honest about limits than overclaim. Three statements that matter:

Software, not a law firm.

LandlordOS is software. It surfaces information from public ordinances and helps landlords organize what they do with it. It is not a law firm, doesn't practice law, and isn't anyone's lawyer. For legal decisions about your specific situation, you should consult a licensed California attorney.

Honest about uncertainty.

The engine produces three confidence states: determined, provisional, and needs review. The labels exist because real compliance has real ambiguity. A determination based on a user-reported build year is provisional until that year is confirmed against the authoritative record. A rule whose applicability turns on a legal judgment we can't make is marked for review. We'd rather a landlord verify something we got right than miss something we got wrong.

In active development.

LandlordOS is currently in a pre-launch phase. Coverage is limited to the City of Los Angeles. The rule set is being built one ordinance at a time, in priority order. The legal text on this site is pre-attorney-review (version 0.1). Some features are in beta. We are working with a California attorney informally on the rule data; a formal attorney pass is planned before public launch.

How we work

Operating principles.

The ordinance rules are the product.
Everything else is plumbing. We don't add features that dilute focus from getting the rules right.
Deterministic engine, AI only for education.
Whether a rule applies to your property is decided by deterministic logic against the ordinance text, not by an AI making a judgment. AI may help draft education content or summaries, but never decides applicability.
Compliance errors are asymmetric.
Being almost-right is often legally identical to being wrong. We bias toward saying a rule applies when uncertain rather than silently excluding it. Honest uncertainty beats false confidence.
State facts, never legal conclusions.
We describe what the ordinance says and what it requires. We don't tell you what to do legally. The line matters.
Data integrity is first-class.
Every action you take produces an append-only audit trail. Files you upload as proof get cryptographic hashes recorded at upload time. The record is built to be defensible, not just decorative.
LA-only at launch is a strength.
Compliance is jurisdiction-specific. A product trying to cover every city in California can't do any one of them well. We start with LA, get it right, then expand.

Where we operate from