September 12, 2018

Keith Peetz

Architect / Engineer Specialist

Community Planning and Development

City and County of Denver

201 W. Colfax Avenue

Denver 80202

RE: Proposed Green Roof Variance at 1551 Wewatta Street

LOG NO: 2018-LOG-0002666

1551 Wewatta is an existing 10-story 300,000 sf Class-A office building constructed in 2003 for the Gates

Corporation and located at 15th and Wewatta. The proposed renovations to the building include:

• The expansion of the 2-story lobby to enclose the existing exterior colonnade with a new

entrance and all-glass curtain wall system

• Ground floor impovements comprising a relocated fitness center and core and shell space for

future retail tenancies.

• A new exterior terrace with green roof only (solar panels and water retention will not be

provided) is to be provided at Level 4 on the roof of the existing podium. This area will include

raised planting areas, a turf area and paved amenity zones.

• A 4th floor amenities area with meeting spaces and breakroom within the fourth-floor office area

and adjacent the new terrace.

• A new stair in the north-west corner of the property to provide egress to ground level from the

roof terrace.

• Upgrades to restrooms and common areas on Levels 1, 2 and 4.

The existing building has roofs at podium level and at the upper level. The upper roof comprises the

Level 10 roof and a small section of mechanical penthouse roof. While significant improvements are

being made to the podium roof structure to support the loads required by the new terrace, no work is

being proposed to the upper level roofs.

An exemption is being requested for the upper roofs based on the fact that these roofs would require

major structural upgrade to enable the support of any green roof. A structural analysis supporting this

position and meeting the requirements of the current Green Roof Ordinance is appended to this

application.

In addition, a variance is being requested in order to enable a cash in lieu payment for the additional

green roof area required but not provided on the Level 4 terrace. The requested variance is based on

the following sections of the current ordinance:

• Section 4.01, b, iv - That the proposed roof of a non-residential structure contains an amount of

area that is intended for recreational or social use by the occupants of the building, and results

in the inability to comply with the requirements for a green roof or green roof combination.

The proposed terrace is intended for social use for the tenants of the building and there is a required

balance of occupiable/usable space for daily use/activities and green space to provide a lush green

environment for the tenants for access to nature, food production and shade. This tenant use the limits

the green roof percentage based on the desired program for the tenant amenity areas.

• Section 4.01, b, v - That the applicant presents other substantial evidence to the Board that

shows it would be unable to provide the required coverage green roof or green roof

combination.

We see the structural exemption requested as a limiting factor in providing green roof at the upper roof

level.

Based on the areas currently proposed for green roof and occupiable terrace at the lower roof the

following summarizes the required Cash-in-Lieu requirements for the project:

Total Roof Area 35,833 SF

Green Roof Area Required (at 60%) 21,500 SF

Upper Roof Area (Structurally Exempt) 27,593 SF

Available Area for Green Roof Area 8,240 SF

Green Roof Only Area Provided 2,880 SF

Non-Green Roof Area Provided (Cash-in-Lieu) 5,360 SF

Required Cash-in-Lieu Payment at $25 per SF $134,000

We look forward to your consideration of this matter. Please contact myself or Leah Hanke should you

require additional information for your assessement.

Sincerely,

TRYBA ARCHITECTS

William M. Moon, AIA

Principal

AUGUST 28, 2018 | © TRYBA ARCHITECTS | 1551 WEWATTA BUILDING REMODEL

GREEN ROOF AREA CALCULATIONTotal Roof Area 35,833 sqft

Total Upper Roof Area (Structurally Exempt)

27,593 sqft

Total Terrace Roof Area 8,240 sqft

3

4

5

6

Green Roof Only Area 2,880 sqft

Unoccupiable Roof Deck Area (Gravel Ballast)

1,622 sqft

Occupiable Roof Deck Amenity Area

3,738 sqft

Upper Roof Area 19,534 sqft

Open Mechanical Area 4,032 sqft

Enclosed Mechanical Penthouse Area

4,027 sqft

1

2

3

4

5

6

Scope of Work

Available Roof for Green Roof Area:

8,240 sf

Green Roof Only Area Provided:

2,880 sf

Non-Green Roof Area Provided

(Cash-In-Lieu):

5,360 sf

Cash-In-Lieu at $25.00/sf:

$134,000

@ 60% Coverage = 21,500 sf Red’d

ISSUE

PROJECT NO.

DATE:

DRAWING TITLE:

© COPYRIGHT TRYBA ARCHITECTS

The ideas, drawings and specifications contained herein are copyrighted by Tryba Architects. Use without the architect’s written consent, as constituted by federal law, is strictly forbidden and written authorization is required for any reproduction.

STAMP:

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05/24/2018

NO. DATE DESCRIPTION

1 01/18/2018 SCHEMATIC DESIGN

2 03/08/2018 DESIGN DEVELOPMENT

3 05/24/2018 CONSTRUCTION DOCUMENTS

LEVEL 04 TERRACE

MATERIALS & GRADING

PLAN

L1.02

M A T E R I A L K E Y N O T E S

M A T E R I A L S L E G E N D

CONC PEDESTAL PAVER TYPE 11.1A

1.1B CONC PEDESTAL PAVER TYPE 2

CONC PEDESTAL PAVER TYPE 31.1C

7.2A COBBLE MULCH

PAVING1.1A CONC PEDESTAL PAVER TYPE 1 (24X24) DTL:

MANUFACTURER: ACKER-STONE        PAVER TYPE: PALAZZO            SIZE: 23 ½” X 23 ½” (NOMINAL)            COLOR: BENTLEY WHITE            FINISH: VENETIAN FINISH            OTHER: SEALED FINISH, PER MANUFACTURER RECOMMENDATION1.1B CONC PEDESTAL PAVER TYPE 2 (12X24) DTL:

MANUFACTURER: ACKER-STONE            PAVER TYPE: PALAZZO            SIZE: 11 ¾” X 23 ½” (NOMINAL)            COLOR: NATURAL PEWTER            FINISH: VENETIAN FINISH            OTHER: SEALED FINISH, PER MANUFACTURER RECOMMENDATION1.1C CONC PEDESTAL PAVER TYPE 3 (12X24 DTL:

MANUFACTURER: ACKER-STONE            PAVER TYPE: PALAZZO            SIZE: 11 ¾” X 23 ½” (NOMINAL)            COLOR: NATURAL PEWTER            FINISH: MONACO FINISH            OTHER: SEALED FINISH, PER MANUFACTURER RECOMMENDATION1.2 ARTIFICIAL TURF DTL:

JOINTING2.1 DECORATIVE JOINT

CURBS, EDGES, STEPS3.1 STEEL EDGER DTL 1 / SHT L4.003.2 CONCRETE BAND

WALLS4.1A FuZE RETENTION EDGE BY ORE (24 IN HEIGHT) DTL 6 / SHT L4.004.1B FuZE RETENTION EDGE BY ORE (24 IN HEIGHT W/ LED TOE KICK LIGHT) DTL 5 / SHT L4.004.1C FuZE RETENTION EDGE BY ORE (4 IN HEIGHT) DTL 7 / SHT L4.00

SITE FURNISHINGS & SITE ELEMENTS5.1A GAS STUB OUT RE: PLUMBING5.1B ELECTRICAL STUB OUT RE: ELECT5.2A SCREEN WALL RE: ARCH5.2B TRELLIS STRUCTURE RE: ARCH5.3 OUTDOOR GRILL (BUILT-IN) SHT L4.015.4 FIRE FEATURE (CUSTOM) SHT L4.025.5 WOOD BENCH (CUSTOM) SHT L4.035.6A TABLE AND CHAIRS (TYPE 1) RE: INTERIORS5.6B TABLE AND CHAIRS (TYPE 2) RE: INTERIORS5.6C TABLE AND CHAIRS (TYPE 3) RE: INTERIORS5.7 TRASH /RECYCLING RECEPTACLE RE: SPECS5.8 MODULAR SOFA RE: INTERIORS5.9 LOUNGE CHAIRS RE: INTERIORS5.10 COFFEE TABLE RE: INTERIORS5.11A PLANTER (TYPE 1) RE: SPECS5.11B PLANTER (TYPE 2) RE: SPECS5.11C PLANTER (TYPE 3) RE: SPECS5.11D PLANTER (TYPE 4) RE: SPECS5.12 PING PONG TABLE RE: SPECS5.13 ADIRONDACK/LOUNGE CHAIR RE: INTERIORS

SITE LIGHTING6.1 WALL LIGHTS RE ELECT6.2 INTEGRAL LINEAR PLANTER LIGHT RE ELECT6.3 BULLET UPLIGHTS RE ELECT6.4 GFCI/DATA BOLLARD RE ELECT6.5 SPOT LIGHT (LAWN ILLUMINATION -BLDG MOUNTED/DIMMABLE) RE ELECT6.6 TRELLIS MOUNTED FIXTURE RE ELECT

PLANTING, MULCH7.1 ORNAMENTAL TREE DTL:7.2A COBBLE MULCH RE SPECS7.2B WOOD MULCH (ALL PLANTING AREAS) RE SPECS7.3 PLANTING AREA RE SPECS7.4 LIGHTWEIGHT SOIL RE SPECS

7.0

6.0

5.0

4.0

3.0

2.0

1.0

LEVEL 04 TERRACE MATERIALS PLAN1 SCALE: 1/8" = 1'-0"

N16'8'4'0'

G R A D I N G N O T E S

CONTOURS REPRESENTED ARE REPRESENTATIVE OF THE GRADEABOVE TOP OF PLANTER ELEVATIONS

G A R D I N G / S O I L D E P T H

36 INCH DEPTH7.4A

7.4B 20 INCH DEPTH

1.2

7.4B

7.4A

7.4A

7.4A

1.1C

1.1B

1.1A

7.2A

ARTIFICIAL TURF1.2

1.1A

7.4B

7.4B

7.4A

7.4A7.4A7.4A7.4A7.4A

1.1C

1.1B

7.4A

7.4A

7.4A

7.4A

POB: PEDESTALPAVER LAYOUT

7.2A

7.2A

7.2A

7.2A

7.2A

POB: PEDESTAL PAVER LAYOUT

POB: PEDESTAL PAVER LAYOUT

POB: PEDESTAL PAVER LAYOUT

3.2

3.2

3.2

(9 E

Q J

TS)

ALI

GN

W/ P

AVE

R J

TS11

7/8

"11

7/8

"

(7 E

Q J

TS)

ALI

GN

W/ P

AVE

R J

TS

11 7

/8"

(9 E

Q J

TS)

ALI

GN

W/ P

AVE

R J

TS1'

-9 1

/2"

L4.008

L4.008

L4.008

2.1

2.1

2.1

2x2 CUT PAVERS ATTHRESHOLD (TYP)COLOR AND FIN TOMATCH ADJ PAVERS

2x2 CUT PAVERS ATTHRESHOLD (TYP)COLOR AND FIN TOMATCH ADJ PAVERS

11 7

/8"

POB: PEDESTALPAVER LAYOUT

POB: PEDESTALPAVER LAYOUT

24"30"

36"

24"

30"

24"30"

24"30"

30"

30"

30"30"30"

24"

24"

24"24"24"

GEOFOAM INFILL (TYP)RE: DTL 8 / SHT L4.00

GEOFOAM INFILL (TYP)RE: DTL 8 / SHT L4.00

36"

36"

36"

36"36"36"

36"

36"

7.4C

7.4C

7.4C 4 INCH DEPTH

SYM QTY COMMON.NAME BOTANICAL.NAME NOTES PLANTING.SIZE SPACING

DEC TREE 1

EGO 6 Oak. English Quercus robur 'Fastigiata' B&B 2 1/2" CAL As shown

ORN TREE 1

AST 4 American Smoke Tree Cotinus obovatus B&B 2.5" CAL As shown

SSA 3 Crabapple, Spring Snow Malus 'Spring Snow' B&B 2.5" CAL As shown

DEC SHRUB 1

DAF 12 Dogwood, Arctic Fire Cornus sericea 'Arctic Fire' CONT 5 GAL As shown

PRL 31 Privet, Lodense Ligustrum velgare 'Lodense' CONT 5 GAL As shown

SUG 15 Sumac, Gro-Low Fragrant Rhus aromatica 'Gro-Low' CONT 5 GAL As shown

ORN GRS 1

BAG 41 Blue Avena Grass Helictotrichon sempervirens CONT 5 GAL As shown

BGA 24 Blue Grama Grass, Blonde Ambition Bouteloua gracilis 'Blonde Ambition' CONT 5 GAL As shown

FAH 198 Feather Reed Grass Calamagrostis acutiflora 'Karl Forester' CONT 5 GAL As shown

FOD 271 Fountain Grass, Dwarf Hameln Pennisetum alopecuroides 'Hameln' CONT 5 GAL As shown

LBS 139 Little Blue Stem, Blaze Schizachyrium scoparium 'Blaze' CONT 5 GAL As shown

PER/GRND 1

BES 11 Black Eyed Susan Rudbeckia fulgida CONT 1 GAL As shown

PCF 18 Coneflower, Purple Echinacea purpurea CONT 1 GAL As shown

JBC 3 Cranesbill, Johnson's Blue Geranium 'Johnson's Blue' CONT 1 GAL As shown

SHD 7 Daisy, Shasta Leucanthemum x superbum 'Alaska' CONT 1 GAL As shown

BIV 8 Ivy, Boston Parthenocissus tricuspidata CONT 1 GAL As shown

ELD 18 Lavender, Dwarf English 'Wee One' Lavandula angustifolia 'Wee One' CONT 1 GAL As shown

ELA 244 Lavender, English Lavandula angustifolia 'Munstead' CONT 1 GAL As shown

SLV 8 Silver Lace Vine Polygonum aubertii CONT 1 GAL As shown

DECIDUOUS TREES

DECIDUOUS SHRUBS

ORNAMENTAL GRASSES

PERENNIAL | GROUNDCOVER

ORNAMENTAL TREES

GE GE

GE

ISSUE

PROJECT NO.

DATE:

DRAWING TITLE:

© COPYRIGHT TRYBA ARCHITECTS

The ideas, drawings and specifications contained herein are copyrighted by Tryba Architects. Use without the architect’s written consent, as constituted by federal law, is strictly forbidden and written authorization is required for any reproduction.

STAMP:

2/5/2018 11:43:19 A

M

1733

1551 WEWATTA

REMODEL

155

1 W

EW

AT

TA

RE

MO

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L

15

51

W

EW

AT

TA

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O 8

02

02

05/24/2018

NO. DATE DESCRIPTION

1 01/18/2018 SCHEMATIC DESIGN

2 03/08/2018 DESIGN DEVELOPMENT

3 05/24/2018 CONSTRUCTION DOCUMENTS

LEVEL 04 TERRACE

PLANTING PLAN

L2.00

M A T E R I A L K E Y N O T E S

M A T E R I A L S L E G E N D

7.2B WOOD MULCH

PAVING1.1A CONC PEDESTAL PAVER TYPE 1 (24X24) DTL:

MANUFACTURER: ACKER-STONE        PAVER TYPE: PALAZZO            SIZE: 23 ½” X 23 ½” (NOMINAL)            COLOR: BENTLEY WHITE            FINISH: VENETIAN FINISH            OTHER: SEALED FINISH, PER MANUFACTURER RECOMMENDATION1.1B CONC PEDESTAL PAVER TYPE 2 (12X24) DTL:

MANUFACTURER: ACKER-STONE            PAVER TYPE: PALAZZO            SIZE: 11 ¾” X 23 ½” (NOMINAL)            COLOR: NATURAL PEWTER            FINISH: VENETIAN FINISH            OTHER: SEALED FINISH, PER MANUFACTURER RECOMMENDATION1.1C CONC PEDESTAL PAVER TYPE 3 (12X24 DTL:

MANUFACTURER: ACKER-STONE            PAVER TYPE: PALAZZO            SIZE: 11 ¾” X 23 ½” (NOMINAL)            COLOR: NATURAL PEWTER            FINISH: MONACO FINISH            OTHER: SEALED FINISH, PER MANUFACTURER RECOMMENDATION1.2 ARTIFICIAL TURF DTL:

JOINTING2.1 DECORATIVE JOINT

CURBS, EDGES, STEPS3.1 STEEL EDGER DTL 1 / SHT L4.003.2 CONCRETE BAND

WALLS4.1A FuZE RETENTION EDGE BY ORE (24 IN HEIGHT) DTL 6 / SHT L4.004.1B FuZE RETENTION EDGE BY ORE (24 IN HEIGHT W/ LED TOE KICK LIGHT) DTL 5 / SHT L4.004.1C FuZE RETENTION EDGE BY ORE (4 IN HEIGHT) DTL 7 / SHT L4.00

SITE FURNISHINGS & SITE ELEMENTS5.1A GAS STUB OUT RE: PLUMBING5.1B ELECTRICAL STUB OUT RE: ELECT5.2A SCREEN WALL RE: ARCH5.2B TRELLIS STRUCTURE RE: ARCH5.3 OUTDOOR GRILL (BUILT-IN) SHT L4.015.4 FIRE FEATURE (CUSTOM) SHT L4.025.5 WOOD BENCH (CUSTOM) SHT L4.035.6A TABLE AND CHAIRS (TYPE 1) RE: INTERIORS5.6B TABLE AND CHAIRS (TYPE 2) RE: INTERIORS5.6C TABLE AND CHAIRS (TYPE 3) RE: INTERIORS5.7 TRASH /RECYCLING RECEPTACLE RE: SPECS5.8 MODULAR SOFA RE: INTERIORS5.9 LOUNGE CHAIRS RE: INTERIORS5.10 COFFEE TABLE RE: INTERIORS5.11A PLANTER (TYPE 1) RE: SPECS5.11B PLANTER (TYPE 2) RE: SPECS5.11C PLANTER (TYPE 3) RE: SPECS5.11D PLANTER (TYPE 4) RE: SPECS5.12 PING PONG TABLE RE: SPECS5.13 ADIRONDACK/LOUNGE CHAIR RE: INTERIORS

SITE LIGHTING6.1 WALL LIGHTS RE ELECT6.2 INTEGRAL LINEAR PLANTER LIGHT RE ELECT6.3 BULLET UPLIGHTS RE ELECT6.4 GFCI/DATA BOLLARD RE ELECT6.5 SPOT LIGHT (LAWN ILLUMINATION -BLDG MOUNTED/DIMMABLE) RE ELECT6.6 TRELLIS MOUNTED FIXTURE RE ELECT

PLANTING, MULCH7.1 ORNAMENTAL TREE DTL:7.2A COBBLE MULCH RE SPECS7.2B WOOD MULCH (ALL PLANTING AREAS) RE SPECS7.3 PLANTING AREA RE SPECS7.4 LIGHTWEIGHT SOIL RE SPECS

7.0

6.0

5.0

4.0

3.0

2.0

1.0

LEVEL 04 TERRACE PLANTING PLAN1 SCALE: 1/8" = 1'-0"

N16'8'4'0'

(18) ELA

(10) LBS

(10) ELA

(6) BAG

10'-6

"

7'-7"

(5) PRL(5) FAH

HERB GARDENPLANTING ZONE

(74) FAH

ANNUAL PLANTINGS, TYP OF 4,FILL WITH LIGHTWEIGHT SOIL

7.2B 7.3 7.4

EQ

EQ

4'-7" 4'-7"

(1) SHD(22) ELA

(5) LBS

(10) PCF

(7) DAF(17) ELD

(4) FAH

(3) FAH(4) BES

(5) PRL

7.1(1) SSA

9'-6" 9'-6"

EQ. EQ.

15'-0

"15

'-0"

4'-8

1/2

"

(36) ELA

(8) FAH

(21) LBS

(33) FAH

(32) LBS

(5) BAG(10) LBS(29) ELA

(4) BAG(23) LBS

(14) LBS

(48) ELA

(12) ELA

(15) FAH

(39) ELA

(20) BAG

(127) FOD

10'-9"

8'-7

"

(24) BGA

7.1

(1) E

GO

7.1

(4) A

ST

EQ

.E

Q.

(11) PRL(8) LBS(5) SUG

(8) BIV

(8) SIL

(10) PRL(6) SUG

7.1

(1) A

ST

7.2B 7.3 7.4

(8) DAF(9) LBS(6) JBC(3) ELD(7) PCF

(6) SHD(7) BES

CL

9'-6

"

P L A N T S C H E D U L E

7.2A

7.2A

7.1

(1) E

GO

7.1

(1) E

GO

7.1

(1) E

GO

7.1

(1) E

GO

CL

5'-3" 7'-4 1/2"9'-6"

7.1(1) SSA

(50) FAH

(20) LBS

(12) BAG

(10) LBS(10) ELA

(30) ELA

(5) BAG

(7) ELA(5) LBS(4) ELA

7.1(1) SSA

(133) FOD

ANNUAL PLANTINGS, TYP OF 4,FILL WITH LIGHTWEIGHT SOIL

ANNUAL PLANTINGS, TYP OF 4,FILL WITH LIGHTWEIGHT SOIL

ANNUAL PLANTINGS, TYP OF 4,FILL WITH LIGHTWEIGHT SOIL