Rent Review and Indexation Clauses: Drafting Them, Then Underwriting Them

How to build a rent review mechanism into a lease and then model it honestly, so growth in your forecast is something the contract can actually deliver.

A rent review clause determines how and when rent changes during a lease. An indexation clause ties that change to a published measure. Both convert an assumption about rental growth into a contractual right, which is the only form of growth an underwriter should give full weight to. The sequence below covers writing the mechanism and then reflecting it in the model without overstating what it will deliver.

Before stage one

This belongs at lease negotiation, not at modelling. By the time you are underwriting an existing building, the clauses are what they are, and your job is to read them precisely. Where you are letting space yourself, the drafting decisions below are made once and then govern income for years.

• A clear view of your intended holding period, since review dates relative to your exit matter.
• The current lease documents for the building, read in full rather than summarised.
• Evidence on how rents for this unit type have actually moved, so the mechanism is realistic.
• Legal input on drafting, because a review clause that is ambiguous is a clause that produces disputes.
• A decision on whether you are prioritising certainty of income or participation in growth.

Stage 1: Choose the mechanism

There are a few basic choices: a fixed uplift stated in the lease, an uplift linked to a published index, a review to market rent determined by evidence or by a third party, or a turnover-related element for retail. Each trades certainty against participation. A fixed uplift is simple and predictable but can fall behind or run ahead of the market. A market review captures reality but introduces negotiation and potential dispute at each review date.

• Deliverable: A stated mechanism with the reason it was chosen for this tenant and this asset.
• Owner: Owner with legal advice.
• Approval gate: The mechanism is chosen before heads of terms are issued rather than negotiated afterwards.

Stage 2: Fix the review dates against your hold

Review dates determine when rent can move and therefore what a buyer inherits. A review falling shortly before your intended exit can be valuable, because it crystallises a higher rent that the buyer capitalises. A review falling shortly after your exit transfers that benefit to the buyer. Decide deliberately rather than accepting a standard pattern.

• Deliverable: A review calendar for the whole building mapped against the intended holding period.
• Owner: Owner.
• Approval gate: No review date is set by default without checking it against the exit plan.

Stage 3: Define the index precisely where indexation is used

If rent is linked to an index, the lease must name the specific published series, the base date, the measurement period, the rounding convention and what happens if the series is revised, rebased or discontinued. Vague references to inflation create arguments at the first review. Decide also whether the uplift is capped, floored or both, since an uncapped link transfers inflation risk entirely to the tenant and may not be accepted.

• Deliverable: Drafted wording naming the series, dates, rounding, caps, floors and a fallback if the series ends.
• Owner: Legal adviser instructed by the owner.
• Approval gate: The clause can be applied by a stranger with the published data and no further explanation.

Stage 4: Set the process for a market review

Where rent reviews to market, the lease must say how market rent is determined: what assumptions apply, what is disregarded, what evidence counts, who decides if the parties disagree and within what timeframe. It should also state whether the review is upward only or can move in both directions, which is a substantive commercial point rather than a drafting detail.

• Deliverable: A review procedure clause including the determination route if the parties cannot agree.
• Owner: Legal adviser with the owner's commercial instructions.
• Approval gate: The dispute route is named and workable rather than left to be decided later.

Stage 5: Translate each clause into model lines

Go lease by lease and convert the clause into dated cash flow entries. A fixed uplift becomes a known step on a known date. An indexed uplift becomes a step whose size depends on an assumption you must state. A market review becomes a step you should model conservatively, because it depends on evidence at a future date and on a negotiation you have not had. Never apply a single blanket growth rate across a rent roll with different mechanisms.

• Deliverable: A lease-by-lease rent schedule with every review shown on its date and its basis noted.
• Owner: Analyst.
• Approval gate: Each uplift in the model traces to a specific clause in a specific lease.

Stage 6: Test what happens if reviews do not deliver

Model a case in which market reviews settle at the passing rent, indexed uplifts come in at the low end of your assumption, and one tenant negotiates a review away in exchange for extending. Look at what that does to income, to cover and to the exit value. This is where contractual growth and hoped-for growth separate, and the difference is usually larger than investors expect.

• Deliverable: A no-growth case alongside the base case, with the decision stated at each.
• Owner: Analyst with the decision maker.
• Approval gate: The deal is assessed on the no-growth case before it is approved on the base case.

Stage 7: Separate contractual growth from market growth in reporting

When you present the deal to a partner, a lender or a committee, distinguish the income growth that the contracts deliver from the growth that depends on market conditions. The first is a legal entitlement subject to the tenant performing; the second is a forecast. Mixing them produces a single growth number that nobody can interrogate.

• Deliverable: A growth bridge showing contractual uplifts separately from assumed market movement.
• Owner: Analyst.
• Approval gate: The split is visible on the face of any document used to support a decision.

Stage 8: Operate the reviews when they fall due

Review clauses only produce income if someone acts on them. Diarise every review and expiry across the portfolio, prepare the evidence in advance of each date, and begin the conversation early enough that the tenant is not responding under pressure. Reviews that are missed, served late or settled casually are a recurring source of lost income in small portfolios.

• Deliverable: A live diary of review and expiry dates with an owner and a preparation deadline for each.
• Owner: Asset manager or the owner personally.
• Approval gate: Preparation for each review begins at a set lead time before the date, not on it.

Handovers between stages

The transfer that fails most often is from the signed lease to the model and then to whoever manages the building. A clause negotiated carefully is worth nothing if the model ignores it and the manager never serves it. Keep one schedule that lists every review, its basis, its date and the action required, and make it the same document that the model reads from and the manager works from.

How you know it is finished

The work is complete when every lease has a mechanism that a stranger could apply, every review is in a diary with an owner, the model reflects each clause individually, and the deal has been tested on the assumption that reviews deliver nothing. Drafting conventions and the enforceability of particular wording are matters for a licensed legal adviser, and the requirements that govern lease registration are updated from time to time, so confirm the current position before issuing documents.

Domira builds the numbers on a Saudi property with you before you commit: rent and cost evidence, condition and capital expenditure, the appraisal and the sensitivities that decide whether the deal survives a bad year. The investment decision stays yours, and so does the advice of your licensed tax and legal advisers.