Lease Abstract

A lease abstract is a structured summary of a commercial lease, capturing the terms that drive billing, recovery, and deadlines. It exists because nobody can run a portfolio by re-reading eighty-page documents, and because the terms that matter operationally are a small fraction of what a lease contains.

What belongs in one

A usable abstract is structured data, not prose. Free-text summaries feel faster to produce and are almost useless afterwards, because they cannot be billed from, reported on, or checked against.

• Premises: suites, rentable and usable area, measurement standard
• Term: commencement, expiration, and any free rent
• Base rent schedule with every step increase
• Recovery structure: pool, share basis, base year, cap, exclusions
• Escalation method, including index, floor, cap, and rounding
• Percentage rent terms and breakpoint, where applicable
• Options: renewal, termination, expansion, right of first refusal, each with its notice window
• Obligations and covenants, with an owner and a due date
• Security deposit, guarantees, and insurance requirements

The versioning problem

Most portfolios lose coherence at the third amendment. The abstract reflects current terms, the history lives in someone’s memory, and answering “what did this lease say in 2023” requires re-reading four documents.

The fix is to version the abstract rather than edit it. An amendment writes a new version and supersedes the prior one, so the terms as of any date remain recoverable. This also matters for recovery: a reconciliation run for 2023 should use the terms that applied in 2023, not today’s.

Abstracting by hand versus extraction

Manual abstraction is slow — commonly an hour or more per lease — and mechanical, which makes it a reasonable target for automation. The useful form of AI extraction proposes each field with a citation to the source text, and requires a person to approve before anything is written.

That distinction matters. An extraction that writes directly to your lease data is a liability; one that stages proposals with quoted evidence turns review into checking a citation.

See how lease abstraction handles versioning and approval.