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other counties for the second lowest proportion of elderly population (11 percent). Perhaps surprisingly, Los Angeles county has the lowest proportion elderly at 10 percent. Riverside and San Bernardino counties have the highest proportion of households benefiting from public assistance (8.6 and 8.9 percent, respectively) while Orange and Ventura counties have the lowest (5.1 and 4.8 percent, respectively). We ultimately used the census data to segment the data set to assist on our analysis. Specifically, high- (or low-) income is defined by whether the census tract median household income is above (or below) the median census tract household income in the corresponding county. High- (or low-) older population proportion is defined by whether the census tract older population proportion is above (or below) the median census tract older population proportion in the corresponding county. The smallest mobile homes are in Los Angeles county as measured by Unit's Size (1,069 square feet) while the largest are in Orange county (1,172 square feet). Ventura and San Diego counties have the oldest units (21.34 and 21.12 years, respectively) while Riverside county has the youngest (16.14 years). Table 5 provides the descriptive statistics for the sample's categorical covariates. Doublewide mobile homes are the most common as indicated by a market share of almost 70 percent for the type `Double'. The second biggest share is for singlewides or the `Single' category at a market share of 27 percent; triple-wides or the `Triple' category represent the luxury high -end mobile homes and have a 5 percent share of the market. The market share of Doublewides in Orange county is about 15 percentage points higher than in Los Angeles, while the market share of Singlewides is about 15 percentage points lower perhaps reflecting the role of mobile homes as a housing choice during the evolution of these adjacent markets. As noted earlier, a number of qualitative ("dummy") variables were created which are critical to the analysis. First, communities are identified in which rent control of mobile home parks is or has been present. Second, the policy is classified as rigid (by-laws which do not permit vacancy decontrol) or flexible (by-laws which permit vacancy decontrol) depending on whether or not vacancy decontrol is permitted. Then transactions within those jurisdictions were identified accordingly. The results of this classification for the aggregate data set also appear in Table 5.