I keep solitary bees myself in a hive I have in my backyard and several "tenants" have moved in without filling out applications first. :) I started out with Japanese Hornfaced bees (Osmia Cornifrons) and ended up with some Masons and a few others I haven't identified yet.

Some Masons can have a "honey bee" look to them at times like the Red Mason bee. My Japanese Hornfaces can be mistaken for a small honeybee at first glance. And even though they are imported, they are starting to become the bee of choice among some commercial apple growers so I am sure they have made their way into the feral population in some capacity. :)

But basically it sounds like it is a solitary bee, so it should be just fine. The nice thing about solitary bees is that they all seem to get along in the same housing unit with no apparent problems [ we humans should take on their example :) ]. Their requirements are very similar as well, so that helps if you are raising them.

If you do a Google Image search on eitber the Red Mason Bee or Osmia Cornifrons (Japanese Hornfaced Bee), you should be able to find some examples of them for comparison to the one you saw.

Well, hope that helps.

Cheers.