Legalized nnisance
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A structure, erection, or other thing which would constitute a nuisance at common law, but which cannot be objected to by private persons because constructed or maintained under direct and sufficient legislative authority. Such, for example, are hospitals and pesthouses maintained by cities.
See Baltimore v. Fairfield Imp. Co.., 87 Md. 352, 39 Atl. 1081, 40 In R. A. 494, 67 Am. St. Rep. 344.