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The bill uses a percent. The lease has an area. You sit with both spread out in front of you, a half-empty lukewarm coffee to your left, and a pen hovering over the margin of your commercial lease where the pro rata share clause is highlighted in pale yellow. The discrepancy between the two numbers nags at you, because even a small percentage difference adds up to a meaningful hit to your annual operating costs, especially if the property’s operating expenses rise over the course of your lease term.
What the paper says
You first confirm the exact language your lease uses to define both pro rata share percent and building area, because those definitions are the only ones that apply to your occupancy costs. Most commercial leases tie pro rata share directly to the ratio of your leased square footage to the total rentable square footage of the property, but some add adjustments for exclusive use areas, ground floor load factors, or shared amenities that are not allocated equally across all tenants. Some leases also specify that total building square footage excludes any space that is occupied by the landlord for their own offices, or any vacant anchor space for the first 12 months it is unoccupied, so you flag those clauses if they appear in your document to make sure you account for them during your review. You note if your lease specifies a “fixed” pro rata share that does not adjust even if the building’s total rentable area changes, or if it is a floating percentage that recalculates each time a new space is leased or a tenant expands their footprint. You also cross-reference if the pro rata share applies to all operating expenses, or only to a subset like property taxes, insurance, and common area maintenance, because some leases carve out specific costs that the landlord covers 100% without passing them to tenants.
What you leave alone
You do not mark up or alter the original lease document in permanent ink, even if you spot what seems like an obvious error on first glance. You also do not cross out figures on the operating expense bill you received, because those edits do not hold any weight when you discuss the discrepancy with your property manager. You leave the original clauses intact, and instead jot notes on a separate piece of scrap paper that you keep clipped to the back of your lease copy for your own reference. You also hold off on sending a formal dispute email right away, because you first need to verify that the discrepancy is not a result of a clause you missed on your first read-through, or a temporary adjustment that the lease explicitly allows for specific calendar years. You also avoid making assumptions about the validity of the bill before you complete your full review, because small adjustments that are allowed per your lease can make the listed pro rata share differ slightly from the basic square footage ratio you calculate on your own.
The ten-minute check
You run through this structured process to quickly confirm if the billed pro rata share aligns with your lease terms:
- First, pull the exact leased square footage figure stated on the first page of your lease, next to your space number and lease term start date. Write this number down on your scrap paper, and confirm it matches the figure used in the pro rata share calculation section of the lease, if that section repeats the space size.
- Next, pull the total building rentable square footage figure stated in the pro rata share definition clause of your lease. If there are two separate figures listed (one for the entire multi-building campus, one for the single building you occupy), confirm which one your lease specifies is used for pro rata share calculations.
- Divide your leased square footage by the total building square footage to get your baseline pro rata share percentage, and compare that figure to the percentage listed on the operating expense bill you received. If the numbers match exactly, you do not need to take further action for this billing cycle. If they do not match, note the difference as a raw percentage point figure.
- Look for any explicit adjustment clauses in your lease that might explain the difference, such as a 2% load factor for first-floor tenants, a temporary adjustment for a vacant anchor space that the landlord is not passing costs on for, or a clause that caps pro rata share increases at 0.5% per calendar year regardless of building size changes.
- If no clause explains the discrepancy, calculate the dollar amount difference between the amount you were billed and the amount you would owe based on your lease’s stated pro rata share, so you have a concrete figure to reference when you reach out to the property management team.
Illustrative example: If your leased space is 2,400 square feet, the total building size is 80,000 square feet, your baseline pro rata share is 3%, but the bill lists your pro rata share as 3.4%, the extra 0.4% adds $480 to a $120,000 annual operating expense budget, which is the figure you will reference when you follow up. If you use Lease Jacket to store your lease documents, you can pull these figures up in seconds without flipping through printed pages to find the relevant clauses.
Where the page goes
Once you finish your ten-minute check, you clip your scrap paper of notes to the relevant page of your lease copy, and store it back in the secure location where you keep all your occupancy-related documents, alongside your lease addenda, previous operating expense bills, and correspondence with your property management team. If you found a discrepancy that requires follow-up, you scan a copy of the relevant lease page and the bill to attach to your email to the property manager, and keep a digital copy of that email thread in the same folder as your lease documents for easy future reference. If you did not find a discrepancy, you mark the bill as approved for payment, and attach a short note to your payment record that confirms the pro rata share matches the lease language for this billing cycle. You do not discard the scrap paper of notes, even if you found no issues, because it will serve as a quick reference point when you receive the next operating expense bill 12 months from now, or when you begin negotiating your lease renewal. You also update your digital records with any new notes about adjustment clauses or confirmed figures, so you can access them even if you are away from your physical lease copy.
What you do not assume
You do not assume that the property management team intentionally inflated your pro rata share to pad their revenue, because most billing discrepancies stem from simple administrative errors, like using an outdated building size figure after a new wing was completed, or applying the pro rata share for a different tenant space to your bill by mistake. You also do not assume that the fixed pro rata share listed on the first page of your lease is automatically correct, because some leases have a clause that adjusts that fixed percentage if you expand or reduce your space mid-term through a formal lease amendment. You do not assume that you have to pay the billed amount immediately if you find a discrepancy, because most leases allow you to dispute operating expense bills within 30 to 90 days of receipt, as long as you provide written notice of the discrepancy and supporting documentation from your lease. You also do not assume that the building size figure listed on public real estate databases matches the figure defined in your lease, because the lease’s definition of total rentable square footage may exclude certain areas like parking garages, mechanical rooms, or landlord office space that are included in public listing figures. You also do not assume that a one-time correction to the pro rata share will apply to all future bills, because administrative systems sometimes revert to old figures if the correction is not added to your tenant profile permanently.
The next time you open it
The next time you open this specific lease page, you will be reviewing a new operating expense bill, or negotiating a lease renewal for your space, or amending your lease to expand into an adjacent suite. You will pull the scrap paper of notes you kept from this review to cross-reference the figures you confirmed today, so you do not have to redo the entire ten-minute check from scratch unless the lease language has changed via a formal amendment. If you previously disputed a discrepancy, you will cross-reference the resolution you reached with the property management team to confirm they applied the corrected pro rata share to the new bill, so you do not end up overpaying for multiple consecutive billing cycles. If you are renewing your lease, you will use the figures you confirmed today to negotiate any proposed changes to your pro rata share, especially if the landlord is updating the total building size figure to account for new construction or renovated space. You will also note if any new adjustment clauses are added to the lease during renewal negotiations, and jot those down on your scrap paper to reference for all future billing reviews. If you are expanding your space, you will use the same formula to calculate your new pro rata share before you sign the amendment, so you can budget for the increased operating costs accurately before you commit to the new space terms. (Word count: 1387)