
Quoting
cdwjava
It may be that the other business could have a claim against the landlord if they were given certain promises in order to conduct their business. Or, you might have a claim against him for not being permitted to utilize your business as you see fit.
However, the details will be contained within the lease agreement so what you might have told the landlord may not be all that relevant if there are sound restrictions in the lease or the true nature of your business is not contained there.
As for a determination of "reasonable" with regards to a noise complaint, only a court can make that determination. The neighboring business may never call the police and they may never demand a private person's arrest, but, if they do then you might get a judge to hear the case a few weeks or months down the road. In the meantime, you might have to keep quiet.
If the landlord knew the true nature of your business and allowed it next to an office, then he may have screwed up and both business may have a cause of action against him ... or, cause to get out of the lease - an option you might want to consider.
Sorry, but there is no easy answer here.