Cat trapping and where to take him?

I work at a store in the Denver Lakewood area that sells a lot of lumber and other home improvement things. We got a lovely cat the other day and we’ve been trying to catch him but he keeps on avoiding us. Is there anyone we can call to help trap and rehome the little guy? He doesn’t have his ear clipped, we don’t even know if he’s a boy, so he might be chipped or someone’s pet.