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We estimate the impact of more stringent minimum lot size restrictions across small border areas of neighboring communities using data from the Wharton Residential Land Use Regulatory Index (WRLURI) surveys. Economically meaningful effects are found on the built environment, not just house prices. Within 100 meters of the borders, housing density as reflected in the number of single family homes per acre is about 11% lower on average in the most restricted communities compared to the least restricted communities in terms of minimum lot sizes. Individual homes are bigger by about 80 square feet, an amount equal to about 4% of typical unit square footage. Lots are over 3,000 square feet larger in the most restricted compared to the least restricted communities' border areas, an increase equal to 28% of the sample mean lot size. Hence, among the smaller number of homes that exist in the most regulated places, their physical structures are modestly bigger and they sit on appreciably larger lots. Finally, house prices are nearly $30,000 higher in the more regulated border areas compared to the least regulated border areas. This price impact can be accounted for by differences in house quality, structure and lot size specifically, on the two sides of a border