Another wonderful architectural masterpiece that Pelli constructed was the salesforce tower in San Fransisco, California. The elegant building joins 18 other supertowers as the only ones standing 300 meters or taller. In San Fransisco, the building towers above all others in the area, allowing for the tower’s blue glass and integrated sunshades gleam over the city for an amazing sight. The tower’s slim, but slightly inflated form sharply contrasts San Fransisco’s 1980s era skylines. The towers structure was build on the focus of stability and sustainability. Integrated metal sunshades in the tower allow for maximizing lights and views to the outside, while at the same time reducing solar gain. As far as the glass, the tower contains low-emission glass to reduce the building cooling load, making it extremely efficient. The 1.1 billion dollar tower is still being finished to house over 5000 employees, as a boom for employment in a popular city like San Fransisco.