How to Assess a Commercial Deal: Yield, Tenure and Lot Size

Understanding Commercial Yields

For the serious investor, the yield is the heartbeat of a commercial property deal. Unlike residential buy-to-let, where the focus often centres on capital appreciation, commercial property is fundamentally a business-led asset. The yield represents the annual rental income expressed as a percentage of the property’s purchase price.

To calculate the Net Initial Yield (NIY), divide the annual net rent by the purchase price, including acquisition costs like Stamp Duty Land Tax (SDLT) and professional fees. A yield of 7% means that for every £1,000,000 invested, you generate £70,000 in gross rent before accounting for vacancy periods or management costs. Remember that yield and risk have an inverse relationship; higher yields often signal higher risk, such as a short lease term, a struggling tenant, or an ageing building requiring significant capital expenditure.

Navigating Tenure: Freehold vs Leasehold

In the UK, the legal structure of your ownership—the tenure—will dictate your operational freedom and your exit strategy.

Freehold ownership gives you absolute control. You own the building and the land it sits on. This is typically the 'gold standard' for investors because it removes the complexities of third-party landlords and ground rent reviews. However, freehold assets often command a premium purchase price.

Leasehold commercial property is more common than you might expect, especially in high-density urban areas. When buying a leasehold, you are effectively buying the right to occupy or sub-let the property for a fixed period. You must scrutinise the 'Head Lease'. Are there restrictive user clauses that prevent you from changing the use of the premises? What is the unexpired lease term? Generally, any lease with fewer than 70 years remaining becomes difficult to finance through traditional commercial lenders, which can severely impact your ability to sell the asset later. Always look for long unexpired terms to ensure asset liquidity.

The FRI Lease Advantage

Once you have secured an asset, the lease agreement is your primary risk-mitigation tool. In the UK, the industry standard is the FRI (Full Repairing and Insuring) lease. Under an FRI lease, the tenant is responsible for the costs of all repairs, maintenance, and insurance of the property.

This structure is highly favoured by investors because it essentially makes the investment 'passive' regarding property upkeep. You receive the rent, and the tenant manages the building’s condition. If you are assessing a deal, always verify if the lease is 'fully FRI'. If it is not, you may be liable for the maintenance of the structure, roof, or external walls—unexpected costs that can erode your net yield quickly.

Matching Lot Size to Strategy

Lot size—the total capital value of the asset—is often overlooked by newer investors who focus solely on yields. However, lot size determines how easily you can finance, manage, and ultimately divest from the property.

Small lots (sub-£500k) often attract local owner-occupiers but can be highly sensitive to interest rate fluctuations. These properties may also carry higher management intensity relative to their income. Mid-market lots (£1m–£5m) tend to offer the best balance between liquidity and income potential. Large-scale institutional-grade lots (>£10m) offer stability but require significant specialist finance and professional management teams to mitigate large-scale vacancy risks.

Before committing to a specific lot size, consider your financing capacity. Specialist lenders often have 'sweet spots' in terms of loan-to-value (LTV) ratios for specific lot sizes. If you are looking to scale your portfolio, accessing exclusive off-market investment opportunities allows you to bypass the competition of the open market and find assets that align precisely with your capital requirements and risk appetite.

Final Assessment Checklist

Before making an offer, stress-test your assumptions. Have you factored in a void period of 6-12 months? Have you stress-tested the rent against potential tenant failure? Does the current yield reflect the genuine market rent, or is the property currently over-rented? A commercial asset is only as strong as its cash flow and the legal framework that protects it. By mastering these three pillars—yield, tenure, and lot size—you can filter out the noise and focus on the assets that will genuinely perform for your portfolio.

Key takeaways

• Yield must be calculated on a 'Net Initial' basis, accounting for all acquisition costs to give a true picture of performance.
• An FRI lease is your strongest protection, shifting the burden of building maintenance and insurance onto the tenant.
• Always check the unexpired term of a leasehold interest; anything under 70 years presents significant financing and exit challenges.
• Align your target lot size with your financing strategy to ensure you maintain liquidity throughout your investment lifecycle.