Professional document workflows have a pattern: when AI tools solve them in one domain, adjacent domains follow within six to eighteen months.

Legal document review went first. Contract analysis, clause extraction, obligation tracking — all of these got productized in legal AI before they showed up in other professional contexts. Legal had the highest concentration of technical buyers, the clearest willingness to pay for document automation, and the most standardized document types.

Financial services followed. Earnings reports, SEC filings, credit memos, underwriting packages — the same capabilities that legal teams were using for contracts got applied to financial documents. Same underlying tooling, different domain vocabulary, different output format.

Real estate is following financial services. The documents are different (leases, offering memoranda, rent rolls, environmental reports) but the workflow is the same: extract structured information from unstructured documents, validate against other sources, generate a synthesis.

What’s interesting is that the tooling layer is converging. The protocol that powers legal document AI is the same protocol that will power real estate document AI. The data extraction engine built for contracts doesn’t need to be rebuilt for lease abstraction — it needs to be retrained and reprompted.

This is the domain adjacency principle: adjacent professional domains adopt the same underlying workflow solutions with a lag. The lag exists because domain-specific data, domain-specific vocabulary, and domain-specific output formats need to be addressed for each new domain. But the underlying architecture transfers.

The implication for builders: the domain that’s furthest behind in the adjacency chain has the most time to build and the clearest roadmap — because the domains ahead of it have already proven every step of the workflow. You’re not pioneering. You’re adapting.

You know what it looks like when it works. You know what the market will want. You know which distribution channels matter. You just have to build it for the domain that hasn’t gotten there yet.

The lag is the opportunity. +++