Company Does Window Installation in Commercial and Residential Buildings

I thought that we must live in a very small world when I saw the window installation San Diego guys at my dentists office. I went to see my dentist for a regular check up and saw the same two window installers that were at my home about three months ago. I struck up a conversation with them but tried not to interrupt their work. I did not know that this company did commercial buildings as well as residential. I may need to let my father know about this because he needs to have the windows replaced in his retail store downtown.