Elegant YET Modern - Business Card Design

C'est ce qu'une entreprise en/au(x) United States recherchait pour leur business card design

I need a business card for my real estate consulting business. I am hired by developers to create and manage marketing and sales programs for their high-end, multi-unit real estate developments. These projects can last a few years. My clients are fast-moving, affluent, no nonsense men (mostly). I need a card that is elegant yet modern, understated yet with a creative touch. Less is more! Colors need to be sophisticated...charcoal grey/white or I'm open.
I would like my tagline: "Elevate Your Real Estate. Accelerate Your Sales." on the back of card with a simple skyline illustration (hopefully I can get the skyline spot colored)...see attached sample
I don't have a logo yet so simple clean chic is good start. I D NOT want a bunch of "Stars" in a row as too predictable. But an interesting treatment of stars in or around logo type could be great.
The FINAL design should communicate: modern elegance, confidence, and restraint Voir plus