Argus modeling is the practice of building a lease-by-lease cash flow projection for a commercial property in ARGUS Enterprise, the valuation software owned by Altus Group. It forecasts each tenant's rent, expense recoveries, and rollover across a hold period, then discounts the result to estimate property value.
How Does Argus Modeling Work?
Argus modeling works by entering every lease as a separate line, then layering market assumptions on top so the software can project cash flow tenant by tenant. Per Altus Group, ARGUS Enterprise supports discounted cash flow and direct capitalization, applying discount rates, terminal cap rates, and growth assumptions to produce an institutional valuation.
The model runs in two halves. The first half builds the property's operating cash flow: contractual rent, expense recoveries, general vacancy, and capital costs for each lease over the hold. The second half handles valuation and investment analysis, applying a discount rate to the projected cash flows and a terminal cap rate to the reversion, then integrating debt and equity to compute levered and unlevered returns.
Input | What it drives |
Lease abstract data | Contractual rent, term, escalations, and expense recovery per tenant |
Market leasing assumptions | Renewal probability, downtime, tenant improvements, and leasing commissions on rollover |
Growth rates | Market rent growth and expense inflation applied across the hold |
Discount rate | Required annual return used to present-value the projected cash flows |
Terminal cap rate | Rate applied to forward NOI to estimate the sale price at the end of the hold |
Because ARGUS models each lease individually, it captures rollover timing that a single-line pro forma cannot. When a lease expires, the software applies the market leasing assumptions, downtime, and re-tenanting costs to that specific suite, which is why lease abstraction accuracy sets the ceiling on model accuracy.
Why Argus Modeling Matters
Argus modeling matters because it is the shared language institutional buyers, lenders, and appraisers use to underwrite income property. ARGUS is described by Altus Group as the industry standard for property valuation and cash flow forecasting, taught in more than 200 universities, so a deal packaged as an ARGUS file can be reviewed without rebuilding the model.
The lease-by-lease structure changes what an underwriter can see. A property with staggered expirations, percentage rent, and different recovery structures per tenant is hard to model in one blended line, but ARGUS resolves each lease on its own schedule. That precision is why the reversion, driven by the terminal cap rate, and the rollover assumptions carry most of the valuation risk in the file.
The single most common failure in Argus modeling is optimistic market leasing assumptions. Renewal probabilities that are too high, downtime that is too short, and re-leasing costs that are too low can inflate value well beyond what the rent roll supports, which is why reviewers scrutinize the assumption set before the output number.
Example
An underwriter models a two-tenant office building over a five-year hold in ARGUS. Tenant A pays $400,000 in year-one base rent, Tenant B pays $250,000, and both carry 3% annual escalations. Recoveries and other income add $90,000, and operating expenses run $210,000 in year one, growing 2.5% annually. The table shows the year-one net operating income build.
Line item | Year 1 amount |
Tenant A base rent | $400,000 |
Tenant B base rent | $250,000 |
Expense recoveries and other income | $90,000 |
Operating expenses | ($210,000) |
Net operating income | $530,000 |
Tenant B's lease expires at the end of year three. The market leasing assumption sets a 70% renewal probability, six months of downtime on turnover, and $40 per square foot of tenant improvements on 10,000 square feet, or $400,000 of re-leasing cost hitting year four. That single rollover event reduces year-four cash flow by the downtime rent plus the capital, which is why the model values this building below a naive projection that assumes Tenant B renews automatically at the same rent.
Variations and Edge Cases
Argus modeling is not one fixed output: the value shifts with property type, the assumption set, and how rollover is handled. The same file can produce different numbers depending on whether market leasing assumptions are aggressive or conservative and whether the exit is an assumed terminal cap or a defined sale price. The table separates common variants.
Variant | Treatment |
Office and retail | Detailed lease-by-lease modeling with recoveries, percentage rent, and rollover |
Industrial | Similar lease structure, often flatter recoveries and longer terms |
Multifamily | Modeled at the unit or unit-type level rather than individual signed leases |
Speculative rollover | Expiring leases replaced by market leasing assumptions rather than a signed renewal |
Terminal value method | Forward NOI divided by a terminal cap rate, the standard reversion approach |
The frequent error is trusting the output without auditing the inputs. ARGUS computes precisely from whatever lease and market data it is given, so a mistake in a single lease abstract, an overstated renewal probability, or a low re-leasing cost flows straight into the valuation. The model is only as reliable as the abstraction and assumptions behind it.
Argus Modeling vs Discounted Cash Flow
Argus modeling is often confused with discounted cash flow, but they are not the same thing. Discounted cash flow is the valuation method: projecting future cash flows and discounting them to present value. Argus modeling is the software-based practice of building that projection lease by lease inside ARGUS Enterprise. DCF is the concept; Argus is the tool that implements it at tenant-level detail.
A DCF can be built in a spreadsheet with a single blended cash flow line, and for a stabilized single-tenant asset that is often enough. Argus adds value when the property has many leases with different terms, recoveries, and expiration dates, because it models each one and each rollover on its own schedule. The output of an Argus model is a DCF valuation; the difference is granularity and the institutional standardization that lets counterparties review the same file.
Frequently Asked Questions
What is ARGUS Enterprise used for in commercial real estate?ARGUS Enterprise is used to model, value, and forecast commercial property cash flows lease by lease. Per Altus Group, it is the industry standard for property valuation, budgeting, and reporting, trusted by investors, owners, brokers, and lenders to produce institutional cash flow projections and discounted cash flow valuations.
Is Argus modeling the same as a DCF?Argus modeling produces a discounted cash flow valuation, but the two terms describe different things. DCF is the method of discounting projected cash flows to present value. Argus modeling is the lease-by-lease practice of building that projection inside ARGUS Enterprise, capturing tenant-level rollover a single-line spreadsheet cannot.
What makes an Argus model inaccurate?An Argus model is inaccurate when its inputs are wrong. The software computes precisely, so errors in lease abstraction, overstated renewal probabilities, understated downtime, or low re-leasing costs flow directly into the valuation. Lease abstraction accuracy and realistic market leasing assumptions set the ceiling on model reliability.
Related Terms
Discounted Cash Flow
Net Operating Income
Exit Cap Rate
Rent Roll
Pro Forma