Condo Owner Calls on King West

The project is focused on a trial group of condominium buildings in Toronto, Canada. It is possible to find out some of the names of the people who live in these buildings through 411 but not their exact unit number. For example, you can find out the names of people who live at 1050 King W., but not their unit number. Therefore you can not mail them something. You can often get the telephone number. This job is for a sales person who can do one of two things: 1. Build a list of people in each building and somehow find out their unit numbers (so we can mail something to them) or emails through some sort of web scraping. 2. Contact these people through phone calls to see if they are interested in our product or want to receive more information. It is a tricky problem and I am very interested if someone has an idea of how to solve this.