Sibley Triangle Building

Listed on the National Register of Historic Places in 1985. 12 historic topographic surveys show this location, the earliest from 1895.

From the record

“Sibley Triangle Building is a historic commercial building located at Rochester in Monroe County, New York. It is a five-story, triangular, flat-iron shaped, brick commercial building with Indiana limestone and marble trim on the first two stories.”
Wikipedia article Sibley Triangle Building, CC BY-SA 4.0.

One of 233 National Register listings published here for Monroe County · listed in 1985 · category: Building.

Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

The listing

What is counted as historic. The nomination lists 1 building as contributing to the listing.
Address. 20--30 East Ave., Rochester, 14604
When was it listed? October 1985
Category. building
Also known as. Inner Loop MRA
City. Rochester city
National Register reference number. 85002849 - the number the National Park Service assigned this property when it was listed, and the key its nomination file is catalogued under at the National Archives.

Fires near this property

2,537 since 2000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 2,537 fires within 5 miles of Sibley Triangle Building between 2000 and 2020, burning about 1,628 acres in total. 171 started naturally. 283 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

Reported cause	Fires
Missing data/not specified/undetermined	1164
Smoking	620
Arson/incendiarism	283
Natural	171
Equipment and vehicle use	101
Debris and open burning	100
Misuse of fire by a minor	48
Power generation/transmission/distribution	28
Recreation and ceremony	17
Railroad operations and maintenance	5

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Date	Cause	Size	Reported by	Name on the report
9 September 2019	Missing data/not specified/undetermined	under an acre	Fire Department of New York	N/A
9 September 2014	Missing data/not specified/undetermined	under an acre	Fire Department of New York	not named
9 September 2009	Missing data/not specified/undetermined	2.0 acres	Fire Department of New York	not named
9 September 2009	Missing data/not specified/undetermined	2.0 acres	Fire Department of New York	not named
9 September 2003	Smoking	2.0 acres	Fire Department of New York	not named
9 September 2003	Missing data/not specified/undetermined	2.0 acres	Fire Department of New York	not named
9 September 2002	Smoking	2.0 acres	Fire Department of New York	not named
9 September 2002	Missing data/not specified/undetermined	2.0 acres	Fire Department of New York	not named

Every fire recorded in Monroe County

Mines and quarries near this property

3 within 5 miles

Regional context, not property-specific evidence. The federal mineral resources record lists 3 workings within 5 miles of Sibley Triangle Building: 1 producer, 1 unknown, 1 plant. 2 still produce. What was taken out: Stone, Crushed/Broken, Silver, Aluminum. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Site	Commodity	Status
Gates Quarry	Stone, Crushed/Broken	Producer
Howard & Bowen Corp/Rochester, N.Y.	Silver	Unknown
Rochester Smelt & Ref/Rochester, Ny	Aluminum	Plant

Every working recorded in Monroe County

Storms near this property

46 since 1995

Regional context, not property-specific evidence. The National Weather Service names Rochester, the town this property stands in, in 46 storm reports between 1995 and 2025: 28 thunderstorm wind, 9 flash flood, 7 hail, 2 flood. The reports record 1 death and 1 injury. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.

When	Event	Place named	Harm	What the report says
June 2007	Thunderstorm Wind	Rochester	1 killed, 1 hurt, $55,000	no account filed
July 2006	Flash Flood	Rochester	$500,000	no account filed
August 2004	Flash Flood	Rochester	$200,000	no account filed
October 1996	Flash Flood	Rochester	$100,000	no account filed
October 1996	Flash Flood	Rochester	$100,000	no account filed
July 1996	Flash Flood	Rochester	$45,000	no account filed
June 1998	Thunderstorm Wind	Rochester	$40,000	no account filed
June 2002	Thunderstorm Wind	Rochester	$35,000	no account filed
August 1998	Flash Flood	Rochester	$35,000	no account filed
May 1998	Thunderstorm Wind	Rochester	$30,000	no account filed
July 2005	Thunderstorm Wind	Rochester	$25,000	no account filed
March 2000	Thunderstorm Wind	Rochester	$25,000	no account filed
August 1995	Thunderstorm Wind	Rochester	$25,000	no account filed
August 1998	Flash Flood	Rochester	$22,000	no account filed
May 2001	Thunderstorm Wind	Rochester	$20,000	no account filed
March 1996	Thunderstorm Wind	Rochester	$20,000	no account filed
July 2014	Thunderstorm Wind	Rochester	$15,000	Law enforcement reported trees and wires down.
June 2008	Thunderstorm Wind	Rochester	$15,000	no account filed
June 2007	Thunderstorm Wind	Rochester	$15,000	no account filed
May 2003	Hail	Rochester	$15,000	no account filed
May 1998	Thunderstorm Wind	Rochester	$15,000	no account filed
July 2018	Thunderstorm Wind	Rochester	$10,000	Tree fell on a house in Rochester.
August 2014	Hail	Rochester	$10,000	no account filed
June 2013	Flood	East Rochester	$10,000	no account filed
May 2004	Thunderstorm Wind	Rochester	$10,000	no account filed
August 1999	Thunderstorm Wind	Rochester	$8,000	no account filed
July 2021	Thunderstorm Wind	Rochester	$5,000	Several reports of trees and powerlines down were received in Irondequoit.
September 2010	Hail	Rochester	$5,000	no account filed
June 1995	Thunderstorm Wind	Rochester	$5,000	no account filed
May 2006	Hail	Rochester	$3,000	no account filed
April 2025	Thunderstorm Wind	Rochester	$2,000	Trees and wires downed.
May 2025	Thunderstorm Wind	East Rochester	$2,000	Power pole broken and lines down on Glazer Dr.
April 2008	Hail	Rochester	$2,000	no account filed
July 2023	Thunderstorm Wind	Rochester	$1,000	A light pole was downed on Lake Avenue in Rochester.
August 2019	Thunderstorm Wind	East Rochester	$1,000	A tree was reported down onto power lines on the 900 block of South Washington.
July 2018	Thunderstorm Wind	Rochester	$1,000	Tree and wire down on Garland Avenue.
July 2018	Thunderstorm Wind	Rochester	$1,000	Trees and wires down on Maple Street.
July 2018	Thunderstorm Wind	Rochester	$1,000	Trees and wires down on Campbell Street.
May 2025	Thunderstorm Wind	East Rochester	$500	Very large tree downed on Crestline Dr.
May 2025	Thunderstorm Wind	East Rochester	$500	Large tree down blocking the eastbound lanes of NY Route 441.
September 2020	Thunderstorm Wind	East Rochester	$500	A large tree was reported down in East Rochester via Twitter.
June 2025	Flash Flood	Rochester	-	Numerous reports of flooded roads and flooded underpasses in Rochester.
August 2023	Flash Flood	Rochester	-	A car was stuck in a sinkhole along St. Paul Boulevard between Paxon Road and Wimbledon Road. There were widespread reports of standing water on roads from Greece to the western portions of Rochester.
October 2021	Flood	East Rochester	-	Flooding was reported in the low lying areas along the Irondequoit Creek between Ellison Park and Powder Mills Park.
May 2014	Hail	Rochester	-	no account filed
June 2009	Hail	Rochester	-	no account filed

Every storm recorded in Monroe County

Maps showing this location

12 surveys

United States Geological Survey topographic sheets whose coverage includes this point. Matched by taking the coordinate the National Park Service records for this property, then testing that coordinate against the published boundary of every sheet.

1895 USGS Rochester quadrangle1:62500
1898 USGS Rochester quadrangle1:62500 - 5 printings
1912 USGS Rochester quadrangle1:62500 - 2 printings
1920 USGS Rochester quadrangle1:62500 - 5 printings
1931 USGS Rochester East quadrangle1:24000
1935 USGS Rochester East quadrangle1:24000 - 3 printings
1952 USGS Rochester East quadrangle1:24000 - 3 printings
1960 USGS Rochester quadrangle1:250000 - 2 printings
1961 USGS Rochester quadrangle1:250000 - 3 printings
1965 USGS Rochester quadrangle1:250000
1971 USGS Rochester East quadrangle1:24000 - 3 printings
1984 USGS Rochester quadrangle1:100000 - 2 printings

Listed places nearby

6 within 8 miles

Other National Register properties close enough to walk or drive between, ordered by distance from this one. Both positions come from the same geocoding pass that matched these properties to their map sheets.

Property	Distance	Listed
East Main Street Historic District	under 500 feet	2017
Rochester Savings Bank	under 500 feet	1972
Sibley's, Lindsay and Curr Building	0.1 miles	2014
English Evangelical Church of the Reformation and Parish House	0.1 miles	1992
St. Joseph Roman Catholic Church and Rectory	0.2 miles	1975
Michaels-Stern Building	0.2 miles	1985

Sources for this property

National Archives record	The nomination case file for reference 85002849 in Record Group 79.
Wikipedia article	Community-written account of this property, licensed CC BY-SA.
Monroe County	All 233 listed properties in this county.

Provenance

Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.
Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.