On this page
Whose building is this about?
The reader here owns a building whose rents someone else limits. In the City of Los Angeles that is the RSO, which reaches rental units first certified for occupancy on or before October 1, 1978. Elsewhere in the county it can be Santa Monica's Rent Control Board, Pasadena's Measure H, the County's ordinance in unincorporated areas or another city's program, and past all of those the statewide cap in Civil Code section 1947.12. Heirs, trustees and partners who end up holding such a building read it for the same reason. They know rent control exists. They want to know what it costs them in a sale.
What does each page do?
Each page follows one rule to the price. Checking RSO status settles coverage unit by unit. The allowable increase and vacancy decontrol under Costa-Hawkins set how fast the income can grow and when a unit can reprice. The Ellis Act page prices the way out of the rental business, the statewide cap governs buildings the RSO leaves out, cost pass-throughs show how much of a capital bill tenants carry, and rent programs in other LA County cities get a row each.
After the rule comes what it does to a buyer's number, the part no ordinance states and the part a sale turns on.
How does a rule get onto a page?
A rule goes onto a page only with its source attached. For the RSO that means the Los Angeles Municipal Code and LAHD's own pages and bulletins. Costa-Hawkins and the statewide cap come from the Civil Code, the Ellis Act from the Government Code and the City's ordinance, and a rule in another city from that city's rent program. The link sits in the sentence that states the rule, so you or your attorney can read the text itself. No legal rule here rests on a news story or a law firm's article alone.
Behind the pages sits a research file with a line for each claim, giving the fact, the address it came from and what that source said. A figure that moves on a schedule appears with the period it covers, such as the RSO's 3 percent for July 1, 2026 through June 30, 2027. A figure that could not be confirmed was left off and the page points you to the agency, which is why no monthly cap is printed for LAHD's Primary Renovation program and none of LAHD's relocation amounts appears on any page. Every worked example runs on invented numbers, labelled as invented, with the arithmetic checked twice. No page prints a sale price, a cap rate or a rent survey, since none could be traced to a public source.
What happens when a rule changes?
A page is reviewed when a statute, ordinance or agency figure it relies on changes. Some of those changes come on a known date. LAHD resets the RSO increase every July, and section 1947.12 is written to expire on January 1, 2030. Others arrive when a council or the Legislature acts, the way the City's new RSO increase formula took effect on February 2, 2026. Each page shows the date it last changed, so you can see how recent its reading is.
Who is behind it, and what does he do?
Shaya Lowenstein writes the guide as a Multifamily Real Estate Advisor working under Lyon Stahl Investment Real Estate, his responsible broker. He holds California real estate license DRE #01942326, which anyone can confirm on the DRE's public license lookup. His office is at 830 S Pacific Coast Hwy, Suite D-200, El Segundo, CA 90245.
He has worked in real estate since 2011, in brokerage and also in operations and development. His focus is apartment buildings and land across Southern California, and the work runs to value-add and repositioning, reading land use and zoning, and long-range portfolio planning for owners, investors and developers.
In a sale he is the seller's listing agent. He works out what a building should bring from a buyer reading its rent roll, then takes it to the open market or offers it quietly to buyers he finds. He does not purchase property himself. He is a licensed real estate agent and he is not an attorney, a CPA or a tax advisor, so coverage disputes, buyouts, Ellis filings and eviction notices belong with a landlord-tenant attorney, and the tax on a sale with a CPA.