The UCLG is a global network of cities and local and regional governments working on governance issues. Its section on Local Governance contains reports on local finances, including interesting insights into property tax performance in several countries.
This interactive website contains information on local finances in several countries around the world. SNG WOFI also publishes reports on revenues and investments with a section explicitly dedicated to property tax.
The Lincoln Institute website has a good number of articles, blogs, and reports on several aspects of property tax, with fascinating insights on property tax performance trends, recent reforms, and property tax system designs.
Explore reports and working papers on tax systems published regularly in low and middle-income countries and valuable for understanding the overall functioning of property tax systems, their weaknesses and strategies for improvements.