There is no law on this. It depends on the rules of the company you work for. If they have a rule that no one is allowed in the building alone then it would be a problem.
agree
"If you are working alone" you punch out, lock up, and go home as being alone there are no other employees.
"Alone" and "together" are opposites in meaning, so "working alone" could not be a form of "togetherness". Togetherness would require at least two people.
Working in a group
...working by yourself, relying only on yourself and going it alone
if a chef works alone, it would be working in a house. But if a chef is working with other people, then that is in either a restaurant, a chocolate company, or a store.
An independent person
individual endeavor
You are working alone & your shift is over at 6:00. The person scheduled to begin working at the 6:00 shift doesn't show. What would you do?
true
Say you are working on a project.
The main things that are considered making a building beautiful are through its durability (stand alone strength) and of course, its design.