sum28 · california

every consequential home will carry a verifiable record.

the industry has learned to generate words. we make words checkable — listing copy checked against evidence, open houses measured for the seller, equity accounted year after year. instruments in, proof out, a name on every seal.

measurement 01 — the asset: home equity

$17.8T

home equity held by american mortgage holders — the largest thing most families own, and the least accounted for. no statement arrives in january. nobody keeps the book.

measurement 02 — the silence: homeowner tenure

12 years

the median hold on an american home. twenty in los angeles. an industry built for the six weeks of a sale — and silent for the decades in between.

measurement 03 — the glut: machine-written listing copy

41% → 17%

agents already generating listing copy by machine — against the share who say it actually changed their business. generated words are free now. words that survive checking are not.

a parcel survey map, brass compass and dossier on a table, a california hillside home in soft focus beyond
the property is not the product; the record is.

the thesis

our read of the decade is short: cognition is going to zero; liability is not. anything that merely writes, summarizes, or predicts will be given away. what stays scarce is the sentence a professional will sign — checked against evidence, priced with a range instead of a guess, safe to hand across a table.

so we don't sell generation. we sell the instrument, the check, and the seal — for the one industry where a single unverified sentence can cost six figures.

the checkable layer of real estate does not exist yet. we intend to build it — quietly, from california, one sealed artifact at a time.

the instruments — p2d, ohm, oak

three products. each name ends in a past participle, because each hands you a completed fact — something you can give to a client, a seller, an heir.

p2d

photo to description, verified

photographs in, listing copy out — every sentence traced to evidence, or it doesn't ship. fair-housing checked in both languages.

live

ohm

open house, measured

a thirty-second sign-in that becomes a seller's report — attendance counted at the door, follow-up documented, placed against the market. the open house, finally accountable.

july 2026

oak

equity, accounted

an annual statement for the home: value range, equity position, tax and insurability facts. arrives every january, like the rest of your net worth.

january 2027
the seal

evidence by sum28

every artifact we produce closes with one bronze mark. scan it, and the evidence opens: the sources behind every sentence, and the checks it passed. the machine stays in the wall. the proof stays within reach.

three-source discipline

voice, market statistics, and facts are kept physically separate. prose may never exceed its evidence.

an independent check

an independent model re-checks every claim against its sources before release. what cannot be evidenced is cut, not softened.

fair housing, gated

every draft runs a fair-housing screen before it ships, in english and in chinese — built to the standard that is allowed to reject it.

the constitution

  1. we will never sell advertising inside an instrument.
  2. we will never sell a lead, a list, or a person.
  3. we will never take per-lead fees from lenders, escrow, or title.
  4. we will never state a point estimate where the honest answer is a range.
  5. we will never risk the trust that prices our name.

restraint is not a style here. it is an epistemology: we do not say more than the evidence allows — in our copy, in our numbers, or on this page.