Whenever I tech scout a location I am always looking for what may effect the sound track, and if so whether or not the audience will be distracted by it. For example, traffic noise is easier to accept if you can SEE it. It’s much harder to accept extraneous noise if you have no idea where it’s coming from. Transformers and hum from lights is also a concern; you want control over heat/AC and traffic control if possible! There are many variables to consider. So, my advice is to pay attention; especially to what’s hidden. Consider what’s behind locked doors, above you and below you. Some things you won’t hear until you have a quiet room and the microphone is cranked up.