LeaseLens Alternatives That Actually Find CAM Overcharges
LeaseLens does one thing well: it reads your lease and pulls out structured data. Lease dates, rent escalation schedules, CAM provision summaries, key clauses. For portfolio tracking and lease administration, that's useful.
It doesn't audit. It doesn't cross-reference your CAM reconciliation against GL line items. It doesn't detect overcharges. It doesn't draft a dispute letter.
If you need lease abstraction for portfolio management, LeaseLens serves that purpose. If you need to know whether your landlord overcharged you on CAM — and by how much — you need a different tool.
This article covers what LeaseLens does, what it doesn't do, what tenants actually need for forensic CAM auditing, and the alternatives with honest assessments of each.
40% of CAM reconciliations contain material errors (Tango Analytics/PredictAP, 2023)
What LeaseLens Does
LeaseLens is a lease abstraction tool. It uses AI to read commercial lease documents and extract structured data: term dates, rent schedules, option periods, CAM clause summaries, insurance requirements, and other administrative terms.
The output is useful for:
- Building a lease data repository across a large portfolio
- Tracking key dates (expirations, renewal windows, rent bumps)
- Providing context for lease administration teams
- Getting a quick read on what a lease contains without manually reading every page
It serves landlords, property managers, and portfolio administrators who need organized lease data at scale. That's a real use case.
What LeaseLens Doesn't Do
LeaseLens extracts what the lease says. It does not verify whether the landlord is following it.
Specifically, it does not:
Cross-reference reconciliation statements against lease terms. Knowing that your lease caps management fees at 3% of total CAM doesn't tell you whether the landlord actually billed 4.2%. That requires comparing the extracted lease term against the line item in the reconciliation statement.
Detect GL-level overcharges. Whether excluded categories (capital expenditures, landlord-specific costs, above-market management overhead) appear in your reconciliation requires reading the reconciliation — not just the lease.
Run detection rules against common overcharge patterns. There are 14 well-documented overcharge categories that appear repeatedly across commercial leases — management fee overages, pro-rata share errors, gross-up violations, CAM cap breaches, base year errors. Detecting these requires matching reconciliation data against lease terms and running calculations.
Draft a dispute letter. Even if you identified an overcharge manually after reviewing LeaseLens output, you'd still need to write the dispute letter yourself.
This isn't a critique of LeaseLens — it's a description of scope. Lease abstraction and forensic CAM auditing are different jobs. LeaseLens does one; it doesn't do the other.
What Tenants Actually Need
For a commercial tenant who suspects a CAM overcharge or wants to verify they're not being overbilled, the workflow requires:
- Extract lease terms governing CAM — exclusions, caps, pro-rata methodology, management fee limits
- Extract line items from the landlord's reconciliation statement
- Compare each line item against what the lease permits
- Identify items that exceed lease limits or fall into excluded categories
- Calculate the overcharge amount
- Document findings with the relevant lease clause
- Generate a dispute letter citing the specific overcharge and the lease provision it violates
LeaseLens handles step 1 partially. Steps 2–7 are outside its scope.
The Alternatives
CAMAudit — Automated Forensic Auditing
CAMAudit runs the full detection pipeline: lease extraction, reconciliation extraction, 14-rule detection, findings report, and dispute letter draft.
The detection stack covers:
Math-based rules (deterministic Python): Management fee overcharge, pro-rata share error, gross-up violation, CAM cap violation, base year error, controllable expense cap overcharge, estimated payment true-up error.
Classification rules (LLM-assisted): Gross lease charges in a net lease, excluded service charges, insurance overcharge, tax overallocation, utility overcharge, common area misclassification, landlord overhead pass-through.
The design: the AI classifies, Python calculates. No model generates numbers — all arithmetic is deterministic. Classification outputs are validated before feeding into any calculation.
Cost: $79 for a single audit. $179 for a 3-pack. $249 for a 5-pack. No contingency, no hourly billing, no retainer.
Turnaround: Under 15 minutes.
What it requires: Your lease (including amendments) and the CAM reconciliation statement for the year you're auditing. No GL request to the landlord needed.
What it produces: A findings report with each flagged overcharge, the lease clause violated, and the dollar amount. Plus a dispute letter ready to send.
What it doesn't do: GL-level forensics requiring the landlord's backend records, litigation support, or negotiation with the landlord on your behalf.
For most tenants — single lease, want to screen before spending money on a human auditor — CAMAudit covers the gap that lease abstraction tools leave open.
Traditional Contingency Auditors
Firms like National Lease Advisors specialize in large-portfolio CAM auditing. They do the full manual process: document collection, GL review, lease interpretation, dispute negotiation.
Cost: $2,000–$5,000 upfront engagement fee plus 33–40% contingency on recovery. Some firms take pure contingency at 33–40% for large portfolios.
Turnaround: 2–4 weeks after document collection, which itself can take weeks.
Best for: Large portfolios with consistent, significant CAM spend where the recovery math justifies the contingency fee. Not economically practical for single-lease tenants with moderate CAM bills.
Honest limitation: At a $50,000 annual CAM bill with a 4% overcharge, the potential recovery is $2,000. A 33% contingency on $2,000 is $660. Combined with a $2,500 upfront fee, you're at $3,160 in auditor cost against $2,000 in recovery. Net negative.
CPA Firms
Accounting firms with commercial real estate practices can perform CAM audits, typically as an hourly engagement.
Cost: $150–$300/hour. A moderate engagement runs 20–40 hours — $3,000–$12,000 before you know if there's an overcharge.
Turnaround: 4–8 weeks.
Best for: Situations with tax implications, formal disputes requiring a credentialed professional, or where an existing CPA relationship includes deep CAM audit experience.
Honest limitation: Most generalist CPA firms don't specialize in lease auditing. They'll catch arithmetic errors but may miss pattern-based overcharges that require CAM-specific knowledge. And the hourly model means you're committing thousands before knowing whether recovery covers the cost.
See also: CAMAudit vs. CPA Firm Lease Audit for a detailed breakdown.
DIY Manual Review
If you have the time and patience, you can do this yourself. Read the lease, read the reconciliation, cross-reference them.
Cost: Free (your time).
Turnaround: Depends on your familiarity with lease language and how many years of reconciliations you're reviewing.
What you'll catch: Obvious math errors. Line items that clearly don't belong (a capital renovation project showing up as a recurring maintenance charge). Anything where the reconciliation number obviously contradicts the lease term.
What you'll miss: Subtle overcharges that require knowing what the typical patterns are — a management fee that's 0.5% over the cap, a gross-up applied at the wrong occupancy rate, a CAM cap that resets differently than the landlord calculated. These require knowing what to look for.
Use the CAM overcharge estimator to get a rough estimate of your potential exposure before deciding how much effort to invest.
Which Alternative to Use
| Need | Best Option |
|---|---|
| Lease data for portfolio tracking | LeaseLens (its actual use case) |
| Quick forensic scan, single lease | CAMAudit ($79) |
| Large portfolio, significant CAM spend | Traditional auditor or CAMAudit 5-pack |
| Formal dispute requiring credentialed professional | CPA firm with CAM experience |
| Litigation or arbitration support | Attorney + CPA specialist |
| Pre-screening before engaging an auditor | CAMAudit, then escalate if warranted |
Most tenants who land on LeaseLens are looking for lease organization tools. If what you actually need is to verify whether you've been overcharged on CAM and recover the money, lease abstraction alone won't get you there.
Read more: CAM reconciliation mistakes to look for in 2026 and how to dispute CAM charges.
Frequently Asked Questions
Can I use LeaseLens output as input to a CAM audit?
In principle, yes — if LeaseLens extracted your CAM provisions accurately, that data could inform a manual audit. But you'd still need to independently review the reconciliation statement and run the detection manually. CAMAudit performs its own lease extraction as part of the scan, so there's no need to pre-process documents through a separate abstraction tool.
What documents do I need to run a CAMAudit scan?
Your lease (including any amendments affecting CAM) and the landlord's CAM reconciliation statement for the year you want to audit. CAMAudit extracts what it needs from those two documents. You don't need to request the landlord's general ledger, which is the main reason traditional audit engagements drag on for weeks.
What if my lease has unusual CAM provisions?
CAMAudit's 14 detection rules cover the most common overcharge patterns in commercial lease auditing. Standard provisions — management fee caps, pro-rata calculations, exclusion lists, gross-up, CAM caps — are fully covered. If your lease has a custom provision outside those categories, the scan will detect standard errors but may not catch the edge case. In that situation, supplementing with a human auditor who can read the full document makes sense. See understanding your audit rights for context on what you're entitled to inspect.