With respect to unit mix, we obtain the age, income, and household composition demographics for our submarket. These are aggregate data, and therefore pertain to all households in the submarket, regardless of whether they are renter households or ownership households. Therefore, it is necessary for us to disaggregate these data on the basis of marginal propensity to consume new for-rent housing.
Once our data are disaggregated, we can then look at the percentage of single-person households versus two or three-person households. This gives us an insight into the optimal unit mix.
With respect to unit size, we must optimize the relationship between net operating income per square foot and total project cost per square foot.
Regression analysis is a statistical analysis tool that allows us to understand causality within a complex data set. It is predictive in nature, and, if employed properly, can be highly useful to real estate developers.
Specifically, regression analysis utilizes the “least squares” method to fit a line through a set of observations. We can analyze how a single dependent variable is affected by the values of one or more independent variables – for example, how an athlete’s performance is affected by such factors as age, height, and weight. We can apportion shares in the performance measure to each of these three factors, based on a set of performance data, and then use the results to predict the performance of a new, untested athlete.
First, we use regression analysis to optimize the net operating income, keeping in mind that because many operational expenses are driven by the number of units and are not the number of square feet, operational expenses per square foot actually decrease with larger unit sizes.
Finally, the relationship between net operating income and total project cost will be optimized, keeping in mind that there are a number of factors to be considered, for example, parking costs and the density of kitchens and baths.
Regression analysis also screens out the “noise” associated with atypical transactions and helps us avoid product selection decisions that might otherwise be emotionally driven or have a limited appeal to our target market.