独特“树状”结构——高层办公楼 / 开普饭

从交通便利性和能见度来看，该地块是芝加哥最好的写字楼位置之一，如果不是因为其梯形的形状，该地块早在很多年前就已经被开发了。

由于东西两边的房产线并不平行，要适合典型的甲级写字楼板块，包括中心核心区和理想的租赁跨度，是一个挑战。

此外，对于任何沿河的场地，城市要求有一条30英尺宽的公共河道，使场地更加复杂。该设计通过一个不寻常的阶梯式中心核心来解决这些挑战，允许每边有45英尺的租赁跨度。

为了避免倾斜的周边，西墙有一系列30英尺宽、5英尺的后退，在整个建筑中容纳一个正交的、5英尺的规划模块。

Offering one of the best office building locations in Chicago in terms of accessibility and visibility, this site would have been developed many years ago if not for its trapezoidal shape. Given that the east and west property lines are not parallel, fitting a typical Class A office floor plate, including the center core and desired lease spans, is a challenge. In addition, for any site along the river, the city requires a 30-foot-wide publicly accessible riverwalk, further complicating the site. The design addresses the challenges with an unusual stepped center core, which allows for a 45-foot lease span on each side. To avoid an angled perimeter, the west wall has a series of 30-foot-wide, five-foot setbacks, accommodating an orthogonal, five-foot planning module throughout the building.

地面平面图

这座先进的甲级写字楼共56层，面积达177万平方英尺。内部空间规划因沿河5英尺的后退而得到加强，提供了相当于14个角落的办公室。

后退创造了一种独特的形式，突出了建筑的垂直度，避免了典型写字楼的纯箱体外观。为了满足城市的要求，该设计提供了一个45英尺宽的河道，河道被覆盖，但实际上是向天空开放的，在62英尺以上。

三个间隔90英尺的大型树状结构元素将塔柱沿河转移出去，并进一步开放场地。

The state-of-the-art Class A office tower totals 56 stories and 1,770,000 square feet. Interior space planning is enhanced by the five-foot setbacks along the river, providing the equivalent of 14 corner offices. The setbacks create a distinctive form that accentuates the building’s verticality and avoids the pure box-like appearance of typical office towers. To satisfy the city’s requirements, the design provides a 45-foot-wide riverwalk that is covered, but effectively open to the sky, 62 feet above. Three large, tree-like structural elements spaced 90 feet apart transfer out the tower columns along the river and further open the site.

标准层平面图

结果是一个景观的、有盖的步行道，连接了两条非常重要的人行道，并保持了有效的无遮挡的河景。

结合其他空间，该地块有50%的空间是开放的，并可在地面上向公众开放。在Wacker Drive一侧，一个45英尺高的大厅由电缆支撑的玻璃墙围住，雕刻的折叠式石灰石覆层覆盖了电梯核心。

低铁玻璃墙的透明性几乎消除了室内外空间的区别，大堂与街景融为一体。

The result is a landscaped, covered walkway that connects two very important pedestrian paths and maintains an effectively unobstructed river view. In combination with other space, the site is 50% open and publicly accessible at grade. On the Wacker Drive side, a 45-foot-high lobby is enclosed by a cable-supported glass wall, and sculpted, folded-limestone cladding covers the elevator cores. The transparency of the low-iron glass wall virtually eliminates the distinction between interior and exterior space, with the lobby and streetscape becoming one.