The Window Center is where the pinnacle of window and door innovation meets luxury living. We're proud to present the Quartz™ luxury collection by Quaker, a lineup engineered to provide unparalleled thermal efficiency, structural integrity, and design flexibility. The Quartz™ collection stands as a testament to what modern engineering can achieve, offering superior energy efficiency and thermal performance values unmatched in the industry.


Quartz CityLine: Elegance Meets Innovation

Clean and Contemporary Design

The CityLine series brings a sophisticated edge to luxury homes, empowering homeowners to transform every room's look and feel. With its clean lines and contemporary design, CityLine ensures that your home will not only be a place of comfort but also a statement of elegance.

Advanced Technology at the Core

Featuring Quaker’s® patented OptiCore® Technology, CityLine windows and doors are built to exceed expectations. OptiCore® represents an architecturally enhanced aluminum frame design that elevates thermal, structural, and sound performance to new heights. Originating from commercial-grade applications, this technology now brings its unparalleled energy performance to residential spaces, allowing for larger windows and expansive views without compromising energy efficiency.

Framed to Perfection

Every aspect of the CityLine series is designed with precision to fit any space or configuration. High-quality framing components ensure that your windows and doors are not only aesthetically pleasing but also robust and secure, matching the unique features of your luxury home.

Uncompromised Construction

Engineered with the most advanced architectural aluminum components, the CityLine series delivers outstanding design flexibility and structural integrity. Each window and door undergoes rigorous testing to achieve an FGIA certified AW architectural rating, guaranteeing performance regardless of size or structural demands.

Superior Corner Joinery

The series utilizes sealant-injected double corner key construction for unparalleled strength in corner joinery and frame, ensuring stability and a water-tight seam. This construction method guarantees that every window and door from the CityLine series will deliver superior performance while offering flexibility in configurations to meet any architectural style.

A Palette of Colors

Quartz™ luxury windows and doors come in a wide range of powder coating and anodized finishes, including two-tone paint options for CityLine windows, allowing for a perfect match to any interior or exterior design palette. This level of customization ensures that your living space is truly your own, reflecting your style and lifestyle preferences.

Tailored to Your Lifestyle

The Quartz™ CityLine series is synonymous with thermal comfort, certified architectural performance, and luxury. With an array of superior component options, these windows and doors are designed to enhance your living experience, providing a perfect blend of style, functionality, and comfort.

To discover more about the Quartz™ luxury collection and the CityLine series, visit The Window Center or contact one of our exclusive consulting partners. Elevate your living space with unparalleled luxury and innovation today.

Contact us to set up an appointment at one of our local showrooms in Grand Rapids, Kalamazoo, or Holland.