Tiffany & Co. Jewelry Store

In 1837 Lewis Tiffany and John F Young used $1000 from Tiffany's father to open a stationery and 'fancy goods' store with fixed prices marked on the items for sale as Tiffany & Young. They only accepted cash payments.

This is where the jeweler relocated after starting out on Broadway across from City Hall in 1837 before moving to Broadway and Prince Street in the mid-19th century. The 1870 headquarters, an ornate 5-story cast-iron building designed by John Kellum. With decorative columns, cornices, and other projections. Tiffany's moved away in 1905.Amalgamated Bank took over the building in the early 1900s, then stripped it of its ornamental loveliness (a safety precaution, as a chunk fell off and killed a pedestrian) in the 1950s.

The Tiffany & Co. flagship store is a ten-story retail building in Midtown Manhattan, New York City, within the luxury shopping district on Fifth Avenue between 49th and 60th Streets. The building, at 727 Fifth Avenue, has served as Tiffany & Co.'s sixth flagship store since its completion in 1940. It was designed by New York City architects Cross & Cross in a "conservative modern" style.

OMA renovated and expanded the 10-storey limestone building, marking its first full-scale renovation since the original opening. They also added a three-storey glass extension to the rooftop to hold gallery and event spaces and can be lit up at night. The extension consists of two stacked glass volumes. The bottom volume is split across two storeys and recessed from the edge of the roof to create a small terrace. The cantilevered volume is clad in panes of undulating glass that was shaped by draping it over a mould in a technique known as slumping. These panels of slumped glass contrast with the simple glazing below to leverage their "two different qualities and distinct advantages". OMA chose the slumped glass because it is "structurally favourable and requires less vertical support" as well as having a subtle "mirrored" finish. 
Elevator cores were moved to the external walls to create a more free-flowing floor plan in alignment with the entranceway. Architect Peter Marino was responsible for revamping the interiors of the building's existing 10 storeys. He added metallic detailing, carpets and wall treatments.