Uncertainty in property valuation: The pricing of flexible leases

It can be argued that the property valuation profession has historically relied upon uniformity as the basis of all capital and rental valuations. Within each property sector, differences in location and design were secondary to the underlying fundamental that the lease contracts for the properties were the same. During the 1980s most leases, in all sectors, were of 25‐year duration with the tenant being responsible for all outgoings. In the early 1990s the lease length reduced but most other terms remained constant. Rental valuation could therefore be made by direct comparison on a pro‐rata basis. Similarly, capital valuation would be made either by direct capital comparison, or by reference to a comparable rent and yield to determine the capital value by the investment method. Comparison was still the principal tool of analysis and this relied upon uniformity of leases within the market. In the late 1990s, the business environment experienced substantial structural change and tenants began to demand bespoke leases to suit their particular requirements. This has led to a plethora of different lease contracts, as tenants require shorter leases, the ability to expand and contract, break clauses and upwards/downwards rent reviews. The market is now as diverse as it was uniform in the 1980s. However, as pricing models relied upon comparison, valuers were reluctant to accept tenants’ new demands for flexibility as it was difficult to price these new contracts. This paper reviews the change in market conditions and equates the new requirements of the tenants with an increase in the uncertainty in the market. It argues that this uncertainty can be built into pricing models using probability‐based models and provides a scenario analysis to price a flexible lease contract.