The paper analyzes one issue, property values, as an impact of Welsch v. Noot which affected zoning practices regarding group homes for mentally retarded persons. Assessed value was used to measure property vaues of 14 group home neighborhoods for the year preceding and following establishment of the home. Data were obtained from local tax records. Percent increase in value during the 2 years was calculated for each house and an average increase in assessed value was derived for each block. Although differences were found between assessed value increase for group home blocks, none of the differences was statistically significant. Overall findings confirmed earlier studies showing that changes in property values are not related to the presence of a group home in the block. Neither the number nor the timing of property transactions in the neighborhood had anything to do with the establishment of a group home. (CL)