cta architects p.c. sk-01 · 3/3/2020 · nyc landmarks preservation commission - public hearing...

CITY HALL STEPS RECONSTRUCTION & NEW EXTERIOR LIFTProject Address: 19

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CTA ARCHITECTS P.C.

Tel: 212.243.7404 [email protected]

151 West 26th Street - 8th FloorNew York, New York 10001-6810

NYC LANDMARKS PRESERVATION COMMISSION - PUBLIC HEARING SK-0103 MAR 2020CITY HALL PARK, NEW YORK, NEW YORK 10007

AERIAL VIEW OF CITY HALL PARK, ~1914SOURCE: NEW YORK HISTORICAL SOCIETY

Department of Design and Construction


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CTA ARCHITECTS P.C.




OVERVIEW OF CITY HALL FRONT FACADE, MAIN STAIRS, EXISTING TEMPORY LIFT AND WALKWAY, AND RAMP AT PLAZA

SCOPE OF WORK:

1. REPLACE EXISTING, NON-ORIGINAL LIMESTONE STAIR TREADS WITH NEW GRANITE STAIR TREADS.

2. REPLACE EXISTING, NON-ORIGINAL LIMESTONE PAVERS WITH NEW GRANITE PAVERS IN PAVING PATTERN THAT REFLECTS THE ORIGINAL DESIGN INTENT, AS SHOWN ON HISTORIC DRAWINGS.

3. REPLACE EXISTING HANDRAIL AT WEST RETURN OF THE STAIRS WITH NEW ADA-COMPLIANT BRONZE HANDRAIL AND INSTALL ADDITIONAL, DETACHABLE ADA-COMPLIANT HANDRAILS ALONG THE CENTER OF THE STAIRS BASED ON HISTORIC PRECEDENT AND EXISTING PROGRAMATIC NEEDS.

4. REMOVE EXISTING, TEMPORARY LIFT, CONNECTING WALKWAY AND RAMP AT PLAZA WITH NEW PERMANENT LIFT WITH CONNECTING WALKWAY AND RAMP TO FACILIATE BARRIER-FREE ACCESS FROM THE STREET LEVEL TO THE PORTICO.

NEW YORK CITY HALLCITY HALL PARKBLOCK 122, LOT 1

AERIAL OVERVIEWNOT TO SCALE1


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SITE PLANScale: 1:15001

TWEEDCOURTHOUSE

CITY HALL

LOWERPLAZA

PARK

ROW

UPPERPLAZA

CEN

TRE

STR

EET

CHAMBERS STREET

BRO

AD

WAY

FOUNTAIN

AREA OF WORK

0 100 150 200 FT

SITE PLAN

OVERVIEW OF EXISTING MAIN STAIRS, LIFT AND CONNECTING WALKWAY


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HISTORIC PHOTOGRAPHS

OVERVIEW OF THE FRONT STEPSSOURCE: THE ARCHITECTURAL RECORD, APRIL 1916

OVERVIEW OF THE PORTICO, LOOKING WESTSOURCE: THE ARCHITECTURAL RECORD, APRIL 1916


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CTA ARCHITECTS P.C.




OVERVIEW OF EXISTING LIMESTONE STEPS, TEMPORARY LIFT AND CONNECTING WALKWAY

EXISTING PHOTOGRAPHS

OVERVIEW OF EXISTING TEMPORARY METAL RAMP AT PLAZA


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OVERVIEW OF EXISTING LIMESTONE PORTICO LOOKING EAST

EXISTING PHOTOGRAPHS

CLOSE UP OF EXISTING RAMP AND WALKWAY AT PORTICO


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CTA ARCHITECTS P.C.




EXISTING CONDITION AT STEPS

TYPICAL CONDITION OF EXISTING LIMESTONE STEPS AT EAST RETURN TYPICAL CONDITION OF EXISTING LIMESTONE STEPS NEAR WEST RETURN

TYPICAL CONDITION OF EXISTING LIMESTONE STEPS AT NORTH WEST CORNER

EXISTING CONDITION OF METAL GRATE COVER AT BOTTOM OF STEPS

TYPICAL CONDITION OF ORIGINAL BRICK ARCH IN CRAWLSPACE UNDER STAIRS CLOSE UP OF ORIGINAL BRICK ARCH IN CRAWLSPACE AT NORTH WEST CORNER


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EXISTING CONDITION AT STEPS

DISPLACED AND SHIFTED TREADS WITH DETERIORATED MORTAR PREVIOUS REPAIR ATTEMPTS NOT MATCHED TO EXISTING LIMESTONECRACKS, DETERIORATED MORTAR JOINTS, UNEVEN COATING

TYPICAL CONDITION SHOWING VARIOUS CRACKS AND DETERIORATIONPREVIOUS REPAIR ATTEMPTS NOT MATCHED TO EXISTING LIMESTONETYPICAL CONDITION SHOWING VARIOUS CRACKS AND DETERIORATION


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CTA ARCHITECTS P.C.




HISTORIC FIRST FLOOR PLAN

UNDATED ORIGINAL DRAWING OF FIRST FLOOR PLAN, SHOWING PORTICO AND VESITBULE PAVING PATTERNSSOURCE: THE ARCHITECTURAL RECORD, APRIL 1916DATE: ~1804

INTERPRETATIONS DRAWN FROM THE ORIGINAL MCCOMB DRAWING:

- PORTICO PAVING PATTERN WAS BEING CONSIDERED IN CONJUNCTION WITH PAVING PATTERNS AT THE VESTIBULE AND CORRIDOR.

- PORTICO PAVING PATTERN WAS NOT INTENDED TO BE HOMOGENOUS ACROSS ALL FIVE ENTRANCES, AS IT APPEARS TODAY.

- EACH ENTRANCE BAY IS CLEARLY DELINEATED WITH THE CENTER BAY EMPHASIZED.


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PROPOSED FIRST FLOOR PLANScale: 1:2501

0 20 30 40 50 FT

PROPOSED FIRST FLOOR PLAN LEGEND

EXISTING TO REMAIN.

NEW GRANITE STAIR TREADS AND PORTICO PAVERS.

NEW CONTRASTING GRANITE PORTICO PAVERS.

NEW GRANITE STAIR TREADS TO MATCH EXISTING.

NEW 3'X5' BLUESTONE PLAZA PAVERS TO MATCH EXISTING.

NEW CONTRASTING GRANITE RAMP CURB.

NEW BLUESTONE RAMP AND LANDING PAVERS TO MATCH EXISTING PLAZA PAVERS.


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EXISTING FRONT ELEVATIONScale: 1/16" = 1'-0"1

EXISTING HANDRAIL TO BE REMOVED.

EXISTING LIFT AND WALKWAY TO BE REMOVED.

EXISTING LIMESTONE STEPS TO BE REMOVED.

0 20 30 40 50 FT

EXISTING SOUTH ELEVATION LEGEND

EXISTING TO REMAIN.

EXISTING LIMESTONE STEPS TO BE REMOVED.


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PROPOSED FRONT ELEVATIONScale: 1/16" = 1'-0"1

NEW BRONZE HANDRAIL, TYP.

NEW GRANITE STEPS.

NEW POWDER COATED STAINLESS STEEL FRAME AND GLASS INFILL PANEL LIFT AND WALKWAY.

0 20 30 40 50 FT

NEW DETACHABLE BRONZE HANDRAIL, TYP.

PROPOSED SOUTH ELEVATION LEGEND

EXISTING TO REMAIN.

NEW GRANITE STEPS.

EXISTING STAIR AND PORTICO PLANScale: 1:751

REMOVE EXISTING TEMPORARY LIFT, WALKWAY AND RAMP.

VESTIBULEREMOVE EXISTING METAL GRATE COVER AT AREAWAY. TYP.

REMOVE EXISTING HANDRAIL.

37'-10" ±

9'-6

" ±

0 4 6 8 10 FT

DN


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CTA ARCHITECTS P.C.




EXISTING STAIRS, PORTICO AND VESTIBULE PAVING LEGEND

EXISTING TO REMAIN.

REMOVE EXISTING LIMESTONE STAIR TREADS AND PORTICO PAVERS.

REMOVE EXISTING BLUESTONE PAVERS.


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PROPOSED STAIR AND PORTICO PLAVER PLAN

PROPOSED STAIR AND PORTICO PLANScale: 1:751

NEW METAL GRATE COVER AT AREAWAY TO MATCH EXISTING.

NEW BRONZE HANDRAIL, REFER TO SK-17.

36'-4" ±

4'-8

" ±

0 4 6 8 10 FT

NEW EXTERIOR LIFT AND CONNECTING WALKWAY. REFER TO SK-18.

NEW DETACHABLE BRONZE HANDRAIL, REFER TO SK-17. TYP.

DN

LEGEND

EXISTING TO REMAIN.




NEW STAINLESS STEEL DIAMOND PLATE WALKWAY AND RAMP.


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PROPOSED STAIR AND PORTICO PLAVER PLAN

PROPOSED STAIR AND PORTICO PLANScale: 1:752

NEW METAL GRATE COVER AT AREAWAY TO MATCH EXISTING.

NEW BRONZE HANDRAILS, REFER TO SK-17. TYP. NOTE: NEW LIFT AND WALKWAY

NOT SHOWN FOR CLARITY.

0 4 6 8 10 FT

DN

LEGEND

EXISTING TO REMAIN.





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HANDRAILS

HOMESHARE |EMBED |HELP |

OVERVIEW OF CITY HALL STEPSSOURCE: NYC MUNICIPAL ARCHIVES COLLECTIONSDATE: UNDATED, ~1960s

NOTE HANDRAILS ALONG CENTER OF STEPS.

EXISTING BRONZE HANDRAIL AT THE WEST RETURN


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PROPOSED DETACHABLE HANDRAIL ELEVATIONScale: 3/8" = 1'-0"2

0 2 3 4 FT

PROPOSED HANDRAILS

2

1

PROPOSED HANDRAIL ELEVATIONScale: 3/8" = 1'-0"1

DETACHABLE HANDRAIL COVER PLATENTS3

7 3/

4"3/8"

DETACHABLE HANDRAIL COVER PLATE SECTIONScale: 1 1/2" = 1'-0"4

NEW BRONZE HANDRAIL COVER PLATE INSERTED INTO POST SLEEVE.

NEW METAL HANDRAIL POST SLEEVE AND BASE PLATE.

7 1/

8" 1 3/

4"3/

8"

EXAMPLE OF BRONZE HANDRAIL SIMILIAR TO PROPOSED HANDRAIL EXAMPLE OF PROPOSED HANDRAIL END VOLUTE

KEY PLANNTS



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CTA ARCHITECTS P.C.




PROPOSED LIFT AND WALKWAY PLANScale: 1:501

PROPOSED LIFT, WALKWAY & RAMP

PROPOSED LIFT AND WALKWAY ELEVATIONScale: 1:502

NEW STAINLESS STEEL FRAME AND LAMINATED TEMPERED GLASS PANEL EXTERIOR LIFT, WALKWAY, AND RAMP. ALL STAINLESS STEEL FRAMING TO BE PODWER COATED TO MATCH COLOR OF EXISTING BUILDING FACADE.

0 4 6 8 10 FT

LEGEND

EXISTING TO REMAIN.



NEW METAL GRATE COVER OVER AREAWAY.

NEW STAINLESS STEEL DIAMOND PLATE WALKWAY AND RAMP.

EXAMPLE OF WALKWAY AND RAMP GLASS PANEL RAILING AND HANDRAIL.

EXAMPLE OF POWDER COATED STAINLESS STEEL FRAMED LIFT WITH CLEAR GLASS PANELS


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CTA ARCHITECTS P.C.




EXISTING PLAZA RAMP

EXISTING TEMPORARY METAL RAMP NEXT TO WROUGHT IRON LAMPPOST AND RAILING TO REMAIN.

EXISTING TEMPORARY METAL RAMP LANDING AT UPPER PLAZA

OVERVIEW OF EXISTING TEMPORARY METAL RAMP

EXISTING TEMPORARY METAL RAMP ENTRANCE AT LOWER PLAZA


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CTA ARCHITECTS P.C.




UP

2

SK-20

UPPERPLAZA

LOWERPLAZA

EXISTING BLUESTONE PAVERS TO REMAIN. TYP.

5'-0" MIN.

PROPOSED PLAZA RAMP PLANScale: 1/4" = 1'-0"1

3SK-2

0

EXISTING GRANITE CURBE COPING STONE AND WROUGHT IRON RAILING TO REMAIN.

NEW WROUGHT IRON HANDRAIL MATCH EXISTING ADJACENT RAILING. TYP.

0 2 3 4 5 FT

PROPOSED PLAZA RAMP

NEW WROUGHT IRON HANDRAIL TO MATCH EXISTING ADJACENT RAILING.

3'-0

"

±6'-6" 17'-6" MIN.

UPPER PLAZA LEVEL

LOWER PLAZA LEVEL

1'-5

1/2

" ±

EQ. EQ. 4'-0" TYP.

6'-4 1/2"

2'-5"

1'-0" MIN.

PROPOSED PLAZA RAMP ELEVATIONScale: 1/4" = 1'-0"2

0 2 3 4 5 FT

LEGEND

EXISTING TO REMAIN.

NEW GRANITE STAIR TREADS TO MATCH EXISTING.


NEW AMERICAN MIST GRANITE RAMP CURB.

NEW BLUESTONE RAMP AND LANDING PAVERS TO MATCH EXISTING PLAZA PAVERS.

NEW GRANITE CURB WALL.

LOWER PLAZA

SECTION THROUGH PROPOSED RAMPScale: 1/2" = 1'-0"3

UPPER PLAZA

EXISTING RAILING TO REMAIN.

NEW HANDRAIL TO MATCH ADJACENT RAILING. TYP.

4"

3'-0

"


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CTA ARCHITECTS P.C.




PROPOSED MATERIALS

NEW MAIN STAIRS & PORTICO PAVERS

STONE: HARDWICK GRANITEFINISH: THERMALEDQUARRY: HARDWICK, VERMONT

STONE: AMERICAN MIST GRANITEFINISH: PROPANE FLAMEDQUARRY: ELVERSON, PENNSYLVANIA

NEW CONTRASTING PORTICO PAVERS

STONE: NORTH RIVER BLUESTONEFINISH: THERMAL BLUE CLASSICQUARRY: WESTERLO, NEW YORK

NEW PLAZA PAVERS & RAMP

BLACK WROUGH IRON

NEW RAMP HANDRAIL

ARCHITECTURAL BRONZE

NEW HANDRAIL AT STEPS

POWDER COATED STEEL AND LAMINATED TEMPERED GLASS PANELS

NEW WALKWAY GLASS PANELS AND HANDRAIL NEW WALKWAY PLATE

STEEL DIAMOND TREAD PLATE

POWDER COATED STEEL

RAL 1013 OYSTER WHITE OR CLOSEST MATCHED COLOR TO BUILDING FACADE

cta architects p.c. sk-01 · 3/3/2020 · nyc landmarks preservation commission - public hearing...

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