Eco-friendly engineering team looking at a building plan Eco-friendly engineering team looking at a building plan Sizes: 640 × 483 / 1,024 × 773 / 768 × 580 / 640 × 483 / 350 × 230 / 380 × 249 / 650 × 427 / 825 × 542 / 304 × 170 / 370 × 279 / 1,200 × 906