Search the following databases for :
In the top box, government or municipal or state
In the second box, "real estate management" or "real estate portfolio"
Consider adding terms like property portfolios, facility management, facility portfolio.
The following sites and datasets might help you when developing a survey instrument.
Search for government websites using Google by creating search strings such as:
building surveys site:gov
municipal property survey site:gov
For instance, such a search rendered this result from the GAO on an evaluation of federal real property: https://www.gao.gov/highrisk/managing_federal_property/why_did_study