1. Concerto A 28-story Residential Tower in Downtown Los Angeles The Englekirk Companies

2. Project Team Developer: Astani Enterprises Architect: De Stefano + Partners Engineer of Record: Englekirk Partners Contractor: Astani Builders Construction Management: Webcor Builders

5. 4th floor plaza with pool, landscaping, and 5-story wood building.

6. 858,220 total area.

7. 348 Condo Units

8. 398,295 SF parking area.

9. Estimated Construction Cost is $150M.

11. Concrete ductile moment frames with 2-way slab construction

14. 4-story tall basement wall thickness is 18” and 16”.

15. Parking structure is supported by isolated pad footings.

17. Underground DWP Vault.

19. Tower Parking Lower Levels Plans

21. Main Lobby

22. Retail and Restaurant

23. Parking Spaces

24. 2nd Floor :

25. Parking Spaces

26. 3rd Floor:

27. Tower – Fitness and Residential Area

29. Tower Parking 2nd Floor Plan

30. Tower Retail and Loft 3rd Floor Plan

35. Typical floor – 8” Post-tensioned Slab.

36. Typical floor to floor height – 11 feet.

37. Perimeter Gravity Columns – 24” and 30” Round.

40. Allow for a more open and visually appealing exterior façade.

42. Six 1-bay Transverse Moment Frames, with 36”x42” beams and a cap beam at the roof

43. Frame Columns are 36”x58” at the base decreasing to 36”x36” at the upper levels. Concrete strength ranges from 11 ksi to 6 ksi.Plan View

45. Cap beam helps provide added stiffness to the building framePlan View Ground Frame Elevation

46. Loft Bldg Tower Section

47. Tower Cross Section

48. Exterior Curtain Wall along the exterior of the building Tower Elevation

49. Tower Elevation

51. The time history analysis allowed us to waive the code minimum base shear, which has the following benefits:

52. Less rebar in beams reduces congestion and reduces demands on columns.

53. Lower axial forces in columns allow smaller column sizes while still maintaining axial stresses below the ductile limit.

54. Followed UBC Section 1631.6:

55. Sets ground motion scaling and number of earthquake records

57. We developed a procedure for their approval prior to starting the analysis

58. Method of ground motion scaling

59. Which code requirements would be waived (minimum base shear, accidental torsion, and redundancy)

60. Modeling assumptions (elastic properties, hinge properties, rigid end zones, mass)

61. Limit states and acceptance criteria

62. Submitted analysis results and design package for panel approval

64. Construction Bottom of Mat Foundation

65. Construction Foundation Pad

66. Construction Shoring

67. Construction Mat Foundation Rebar Placement – August 22,07

68. Construction Mat Foundation Rebar Placement – August 22,07

69. Construction Mat Foundation Rebar Placement – August 22,07

70. Construction Mat Foundation Rebar Placement – August 22,07

71. Construction Mat Foundation Rebar Placement – August 22,07

72. Construction Tower Column Rebar Placement – November, 07

73. Construction Tower lower level floors – November 28,07

74. Construction Shotcrete walls

75. Construction Parking Structure Foundation – November 28,07

76. Construction Parking Structure Foundation – January, 08

77. Construction Parking Structure Foundation – February, 08

78. Construction Parking Structure Lower Levels – February, 08

79. Construction Parking Structure Lower Levels – April, 08

80. Construction Tower Ground floor – January,08

81. Construction Tower Building – 6th floor - March 08

82. Construction Tower Building – 10th floor – April 08

83. Construction Tower Building – June 08

84. Construction Photos Tower Building

85. Construction Typical Tower PT Slab

86. Construction MEP Coordination

87. Construction Slab Column Connection

88. Construction Slab Column Connection at Perimeter

89. Tower Slab MEP Penetration Plan

90. Tower Slab MEP Penetration Plan

91. Construction MEP Coordination

92. Construction MEP Coordination

93. Construction MEP Coordination

94. Frame Beam Penetration Detail

95. Construction MEP Coordination

96. Construction MEP Coordination Frame Beam Penetration

98. Connection Detailing Frame Beam Joint

99. Connection Detailing Frame Beam Joint

100. Loft Building

102. Construction Photos

104. Assist architect / developer in selecting a functional and cost-effective solution

105. Coordination work between disciplines