Transaction price residential (house) and commercial property price indexes (RPPIs and CPPIs) have inherent problems of sparse data on heterogeneous properties, more so CPPIs. In an attempt to control for heterogeneity, (repeat sales and hedonic) panel data regression frameworks are typically used for estimating overall price change. We address the problem of sparse data, demonstrate the need to include spatial price spillovers to remove bias and propose an innovative approach to effectively weight regional CPPIs along with improvements to higher-level weighing systems. The study uses spatial panel regressions on granular CPPIs for the United States (US).