CoStar lease abstraction: lease data for CoStar Real Estate Manager, in minutes

CoStar lease abstraction is the work of pulling the operative terms out of a commercial lease and getting them into CoStar Real Estate Manager, so the platform can run lease administration, track critical dates, calculate right-of-use assets and lease liabilities, and produce audit-ready disclosures. CoStar stores the data and calculates on it. Producing that data is a separate step upstream, done by a person reading the document, by an outsourced abstraction team, or by an AI extraction tool whose output a person reviews.

CoStar itself describes abstraction as extracting critical terms from lease documents and converting them into structured, searchable fields, and notes it can be done by specialized software, subject-matter experts, or a combination of the two. That framing matters, because the choice of route is where most of the cost and most of the schedule risk sits. The platform decision is usually made months before anyone counts how many leases have to be abstracted before go-live.

There are four practical routes, and they trade cost against turnaround:

The fourth route is what Leaseabstracts does. Upload the lease and every amendment, the AI reads all pages and fills the abstract, your administrator reviews the source-linked fields, and you export to Excel or CSV for import or entry into the CoStar lease record. The output is not locked to one platform, so the same abstract loads into CoStar, Yardi Voyager, MRI, or RealPage.

A CoStar record that supports both administration and accounting needs more than the term and the base rent. These are the field groups that decide whether your team can work from the system or has to reopen the PDF every time a question comes up:

Two of these cause most of the rework. Operating expense structures entered as plain net when the lease carries a cumulative cap on controllable expenses will produce a reconciliation your landlord or tenant disputes, which our CAM and operating expense extraction page covers in detail. And an option keyed without its notice deadline as an actual date is an option somebody eventually misses, which is the whole point of a critical dates register.

CoStar automates lease classification, measurement, and disclosure for ASC 842, IFRS 16, GASB 87, and GASB 96. Every one of those calculations runs on abstracted inputs, and the calculation is only as defensible as the field behind it. Four inputs decide most of the number.

The commencement date is the date the lessor makes the asset available, not the execution date and not the rent start date, and getting it wrong shifts the entire schedule. The lease term includes renewal periods your company is reasonably certain to exercise, which means an option cannot be abstracted as a yes or no, it needs its window, its rent basis, and the economics that make exercise likely. Fixed payments and in-substance fixed payments belong in the measurement while genuinely variable payments based on usage or sales do not. And a tenant improvement allowance is a lease incentive that reduces the right-of-use asset, never something netted against leasehold improvements, which our TI allowance accounting guide walks through with journal entries.

Because every field in a Leaseabstracts abstract links back to the page and clause it came from, the audit conversation stops being a search exercise. An auditor sampling twenty leases can be shown the source clause for each input in the time it used to take to find the lease file. See our ASC 842 lease data extraction page for the full input list.

Implementation is when abstraction volume spikes and the usual approach fails quietly. The pattern that works is to abstract in one pass against a fixed field list rather than letting each analyst decide what matters, so the export lands in CoStar in a consistent shape and the exceptions are visible instead of buried.

Three decisions are worth making before the first lease is opened. Agree the field list up front, ideally the one your CoStar configuration expects, so nothing has to be revisited at 80 percent complete. Confirm every lease file is complete, because an abstract built from a base lease whose three amendments sit in a different folder will be confidently wrong about the rent, the failure mode our lease amendment and addendum guide explains. And decide who signs off. Source-linked output turns review into a fifteen minute check rather than a re-read, but a person still has to approve before the data becomes the record your disclosures rest on. For transaction timelines specifically, see lease abstraction for due diligence.

CoStar does not publish a rate card for Real Estate Manager. Pricing is quoted per organization and depends on portfolio size, which modules you license, and implementation scope, and CoStar market data is licensed separately from the platform. Any specific annual figure you find on a review site is a third-party estimate, so treat it that way and get a quote.

What is worth separating in that quote is the software from the data work. The subscription buys the system that stores, calculates, and reports. Abstraction is the labor of producing what goes into it, and it is priced separately whether you do it in-house, buy it as a service, or run it through a tool. Published 2026 market surveys put outsourced abstraction anywhere from roughly $25 to $100 per lease for offshore and technology-assisted work, and higher for US-based full-service abstraction with senior review, with turnaround of two to five business days. Our lease abstraction cost guide breaks down what actually drives those numbers, and the AI versus offshore comparison covers the tradeoff on speed and control.

Upload the executed lease and all amendments. The AI reads the full document set and produces a structured abstract with each field linked to the page and clause it came from and a confidence score showing where to look first. Your administrator reviews, corrects anything, and exports to Excel or CSV.

From there the clean data loads into CoStar Real Estate Manager, the dates flow into your critical dates reporting, and the accounting inputs feed the ASC 842 schedules. Because you keep the exported files, the abstracts stay yours if you ever change platforms, which is not true of data that only exists inside someone else's subscription. Teams still comparing systems can start from our lease management software guide or the lease abstraction software roundup.