The downtown Miami site picked for a new courthouse has arsenic, lead and other pollutants, according to a memo by Miami-Dade County. The courthouse can still be built there, but whether the necessary cleanup would push back completion and how much costs would be affected aren’t clear, the county said.

Miami-Dade County is developing a new civil and probate courthouse on a vacant half acre it owns along Flagler Street between the existing courthouse and the Metromover tracks. The new facility is needed because the existing one, built 91 years ago at 73 W. Flagler St., has termites, mold, and water and plumbing leaks.