20761146435

20761146433

20761146431

20761146429

20761146427

20761146425

20761146423

20761146421

20761146419

20761146417

20761146414

20761146412

20761146410

20761146408

20761146406

20761146404

20761146402

20761146400

20761146397

20761146395

20761146393

20761146392

20761146391

20761146390

20761146389

20761146388

20761146387

20761146386

20761146384

20761146383

20761146382

20166162164

20166162163

20166162162

20166162161

20166162159

20166162158

20166162157

20166162156

20166162155

20166162154

Steel columns and reinforced concrete slabs were erected four stories at a time, ?with the curtain wa

20166162152

Philip Johnson, "at once the elder statesman and the enfant terrible of American architecture," (2) w

20166162150

20166162149

Three types of glass are used on the exterior: double-glazed vision glass with reflective coating at

Because PPG Industries manufactures architectural glass, a glazed curtain wall system became a natura

20166162146

20166162145