Someone once came to the Chazon Ish on Shabbos from Tel Aviv. The Chazon Ish asked how he came from outside Techum Shabbos? The visitor answered, “people say” new buildings have already been built in the gap. Upon which the Chazon Ish asked the visitor to refrain from touching the wine…
Rule: If you don’t know that an action is permitted, then for you it isn’t.
Have you ever used a business located in a residential building (kindergarten, Kippah store, barber, etc.)?
Was the establishment several floors up?
What gives you the right to use the elevator on your way there?
Perhaps you assume the business pays a larger share in elevator expenses (ha!). Well, what gives you the right to “assume”?
Were you then asked to serve as a witness at a wedding?
Did you say yes?
Eh?