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Buildings with metal roof and metal or masonry facades are basically Faraday cages so there wouldn't be signal to begin with. Some florescent lights do jam the AM band . Asside from the 2-3 strongest AM stations in the area the florescent lights in the garage either add a frustrating amount of buzz or outright jam most AM stations. Many newer florescent lights have switch mode supplies that jam everything... many switch mode supplies jam everything (I can't use power inverters to demonstrate radios at swapmeets because they jam the whole AM band).
McDonald's is so bad a number of AM and FM stations die when I get my car radio within 20' of their building.
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