Triangular 5

Source: pcf-p.com

Laura Spelman Rockefeller Halls, Princeton University, Princeton, New Jersey, USA, 1973 designed by Pei Cobb Freed & Partners

Privacy and openness are combined and preserved by the triangular shapes and diagonal placement of each building. The structures are interwoven by pedestrian byways and highways, leading into each building, through arcades or short-circuiting to other parts of the campus. -- architect's web site

Source: wikipedia.org

590 Madison Avenue(formerly IBM Building), New York City, New York, USA, 1983 designed by Edward Larrabee Barnes

The building was designed as a unique wedged shape cutting South West corner of rectangular box. The volume can be seen differently from different angles, sometimes slender, sometimes gigantic. The entrance of the building is the most impressive part of the façade providing spectacle and openness to the street and welcoming visitors.  -- Wikipedia

Source: SOM

The New Beijing Poly Plaza, Beijing, China, 2007 designed by SOM

The unique design solution incorporates 24 stories of office space built around a 90-meter-tall atrium enclosed by the world’s largest cable-net-supported glass wall. The museum occupancy is contained in an eight-story hanging ‘lantern’ suspended in the building atrium from four parallel strand bridge cables.  -- architect's web site

The building’s simple, monolithic triangular form is based on an L-shaped office plan enclosed by an expansive, glass cable-net wall. The bars of office space align with the surrounding development while the large atrium looks outward to the intersection and the existing China Poly building beyond.  -- World Architecture News

Source: Wison Tungthunya archdaily.com

Plan, Source: archdaily.com

VNG Office, Bangkok, Thailand, 2012 designed by Openbox Company

Since the site was already very tight, the form was simply the shape of the site, stretched to maximum, build-able envelope according to regulation setback. This turn out to be an unexpected opportunity to exploit unique form and space that would be difficult to justify under normal circumstance. -- ArchDaily