About
We were the case study before we were the firm.
Martenfield is a founder-led firm. Delivery is staffed to the engagement. We measure whether AI answer engines cite proptech and commercial real estate software companies, then build the layer that makes them.
Where this came from
We operate REN.PH, a Philippine real estate data platform with more than 60,000 verified nodes. It was built as a data business, not as a marketing exercise, which meant entity architecture, provenance tracking, verification, and freshness systems had to work before anyone was sold anything. A national property dataset does not function without them.
In June 2026 a US commercial real estate company found REN.PH through ChatGPT and made contact. Three weeks later a Zurich proptech company found the same platform through Google Search. Neither came from advertising or outbound. Both arrived because a model had something specific to retrieve and cite.
How we work
Clients are never named
Non-disclosure is policy, not a case-by-case negotiation. Outcomes are published redacted, with the figures and the method stated. A redacted result with a stated method is weaker proof than a named logo, and it is the trade we make so that clients can tell us the truth about their data.
The niche is held narrow
Proptech and commercial real estate technology only. Broader framing tests better in the abstract and fails in practice: our evidence is a proptech platform cited into a proptech buyer's answer and it does not transfer, and query packs and source maps only compound inside one category.
Method is versioned and published
Every number on this site carries a stamp saying when it was collected, which engines were queried, how many runs per query, and which method version produced it. Currently v1.0. When the method changes, the version changes, and old numbers keep their old stamp rather than being quietly restated.
We measure ourselves too
martenfield.com sits in the same tracking pipeline as client work, against its own query set. We publish those results quarterly, including the early ones where we do not appear at all. It is the one case study whose permission we do not need.
Who we turn down
A written disqualify list is cheaper than a bad engagement, for both sides.
If your first question is the monthly rate, the honest answer is that we are probably not the right firm. Start with the audit, or do not start.
Who runs it
Aaron Zara
Founder
Operator of REN.PH and a portfolio of Philippine property and data businesses. Eighteen years building on the web, most of it on systems where the data model was the product rather than a detail behind the marketing site.
Martenfield exists because the same architecture that makes a property dataset trustworthy to a human is what makes it legible to a model, and almost nobody in proptech has built either.