PER CURIAM.
This case will be affirmed for reasons adequately stated in the opinion of the District Judge, 56 F. Supp. 862. The fact that the buildings here were permanent and not temporary structures furnishes no adequate ground for distinguishing the case from the one before this Court in United States v. City of Chester, 3 Cir., 144 F.2d 415. We gave careful consideration in that case to the real questions now before us and see no reason to modify the conclusions there announced.
Affirmed.