Your tagline was the inspiration for the use of the elevator button graphic in combination with the M monogram. I used the letter M to build on the equity you have established in your target market with the name, Metro. The emphasis of going up defines what you're all about in delivering knowledge and quality of service in your industry. This graphic is positive and aspirational-perfect as your business will continue to grow for years to come.
Without the text, metro elevator, the symbol alone conveys your work in the elevator industry and captures your brand's essence. I brought it up to date but kept it simple, memorable and timeless--the designs are simple and clean so that they function in multiple environments at any size from large truck graphics to a small logo on a business card. Also, the design is simple and versatile enough to be embroidered on a shirt or hat while colors kept at a minimum to reduce printing cost.
Please let me know if you'd like to see revisions. Feedback is welcome.