CAP RATE FORMULA
Cap Rate = Net Operating Income (NOI) / Transaction Price
According to textbook definitions (Greer and Farrell, 1992), the NOI used for the estimation of the cap rate, or the overall capitalization rate, is the projected net operating income of the property during the first year following its acquisition. Thus, taking into account the different time periods that the components of the cap rate formula refer to, the correct mathematical expression for this formula is :
CRt = NOIt+1 / TPt
Where: Cap Rate = 100,000/1,000,000 = 0.10 = 10% The estimated cap rate represents and the income return in the firs year of the holding period and that is why it is often referred to as initial yield.
Notice that projections of next year NOI can be quite complicated for multi-tenant commercial properties with many tenants. First of all coming up with projections of rental income requires looking at the leases of each tenant, figuring out whether there are annual escalation clauses, what percentage increase is applied to each lease and what particular date of the year. There may be also expiring leases in which case it is necessary to make some assumptions as to whether they will be renewed and, if not, how long the space will remain vacant. In addition, operating expenses will depend on how much space is occupied. For this reason, in most cases in applying the cap rate formula to current market transactions for deriving market capitalization rates, it is more likely to have data on the current NOI of the property at the time of the transaction rather than projections for next year. In many cases, even the former piece of information is not known and some data vendors may use in the cap rate formula an estimated NOI based on market rents, which is then applied to the announced sales price of a property to derive a “market capitalization rate”.
Cap Rate = NOI / Appraised Value Appraisal-based cap rates do not reflect market capitalization rates as accurately as transaction-based cap rates, given that the transactions used for the estimation of the latter are normal arm’s length market transactions and there are no distortions of transacted prices for any reason. An example of appraisal-based capitalization rates are those provided by the National Association of Real Estate Investment Fiduciaries (NCREIF). NCREIF maintains income data (including NOI), appraised values and other data on properties held by its members that include most of the institutional property investors in the United States.
When using market cap rates provided by vendors investors need to have in mind that these vary by property type, within property type (according to product quality), by location and other attributes that influence cap rates, as well as across markets and within markets. Thus, when trying to derive a cap rate to be applied to a specific property, market cap rates for the corresponding property type should be adjusted to reflect the idiosyncratic advantages and risks of the property considered.
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