What are some good ideas for a grand opening for a construction company?

Question

Basically we are relocating to offices with better facilities. The company's activity is building houses and then sells them.

Answer 1

Have a contest to have a small service that your company provides( like make a closet) as a prize for the best idea that your company can do as a job. Then get all your resources ( friends, family, internet experts) to pick that idea and advertise like hell to provide that for a fee.

Answer 2

Build a show house, get lots of people gathered by it (press, general public) and cut a ribbon or something.