It's a business building which is accessible by the public during business hours. There's no reason why you can't park in the lot and wait for him to show up. It's not like you'd be waiting in his front yard. If anyone hassles you, all you have to do is tell them you're there to apply for a job, which in a way is true since you want to see first hand how your money is being put to work. Actually we are all part owners of that sign and our money contributes to the monthly rent, so we actually have every right to be there.
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