The Housing Market Transparency Act requires the Department of Housing and Urban Development to collect detailed information about properties that receive low-income housing tax credits and make that data publicly available. The bill covers buildings funded through this federal tax credit program and requires states administering these credits to submit data to HUD within 18 months of a property opening and then annually thereafter. The collected information includes development costs, ownership details, inspection records, and information about when affordable housing protections expire or properties change hands. HUD must establish reporting standards, assist states with data collection systems, and publish the compiled information at least once per year, along with periodic reports on the low-income housing market. This legislation aims to increase transparency around the use of federal housing tax credits and help monitor whether these subsidized properties remain affordable and well-maintained over time.