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Downtown Commercial Core · Calgary office building record

Nexen Building, Calgary

Office · 2 separately assessed accounts · office tower · built 1979 · 801 7 Ave SW

LiDAR roof height157.2 m

Storey-equivalent (derived)40

Footprint3,043 m²

Parcel4,094 m²

Year built (roll)1979

Assessed 2026 (2 accts)$40.5M

Structures on parcel2

Nearest CTrain66 m

Civic address: 801 7 Ave SW, Calgary, AB
Community: Downtown Commercial Core (DNC)
City sub-property use: C101 Office × 2 · all Office sites
Land use district: CR20-C20/R20 — Commercial - Residential Core (Commercial - Core)
Height rank: #13 of 580 citywide · #11 of 111 in Downtown Commercial Core
Site coverage: 74% of parcel under LiDAR footprints
Parcel pieces: 1 titled piece · roll 067243402 and 1 more
Coordinates: 51.046508, -114.079301

Massing and site plan

Left: isometric massing of every LiDAR structure on the parcel, at true scale, viewed from the south-west with 3.9 m storey lines. Right: plan of the parcel with surrounding footprints, Plus 15 walkways and nearby stations. Open this building in the 3D city →

157.2 m · 2,864 m² · 16.9 m · 179 m²

Context within 160 m. Grey footprints darken with height; lime is the Plus 15 network.

How it compares

Roof height against the Downtown Commercial Core median and tallest, and against the city.

Access

Public-geometry tests only; confirm routes, entrances and hours with the building.

CTrain

Nearest station: 8th Street SW, 66 m straight-line (route 201/202). Planned Green Line station 7 Avenue SW is 802 m away (Downtown Segment, per the City’s Green Line map).

Other office buildings near 8th Street SW Station →

Plus 15

The City’s Plus 15 walkway geometry touches this parcel; the plan above shows the connected segments in lime. Confirm access points, hours and the interior route with the building.

Heritage inventory

The City of Calgary Inventory of Evaluated Historic Resources records the following on this parcel.

NOVA Building Complex (Nexen Building NOVA, An Alberta Corporation, Corporate Head Office Alberta Gas Trunk Line Head Office Building)

Construction year: 1979
Architect: Llewellyn Fredrick Valentine of J.H. Cook, Architects & Engineers
Builder: CANA Construction Co. Ltd
Style: Modern
Typology: Office Tower (south building) and Facilities (north building)
Development era: 1957 to 1982 (Modern)
Designation: Inventory listing only

The NOVA Building complex is valued as a symbol of NOVA's pivotal role in Alberta¿s gas development and growth. Through its development of one of the largest and most technically-advanced gas transmission systems in the world, and established as a publicly mandated company, NOVA was a major enabler of Alberta's vibrant natural gas and gas chemicals industries (Symbolic value, City-wide significance).

The NOVA Building complex is also valued for its association with Bob Blair, President and Chief Executive Officer of NOVA. Blair, a visionary entrepreneur, aggressively grew NOVA from its Alberta Gas Trunk Line Company roots into a diverse international player in gas transmission, gas marketing, petrochemicals and plastics, manufacturing and resource development. This building is a direct result of Blair's vision and optimism for gas development in the province (Person value, City-wide sig

Character-defining elements: Key elements that define the heritage character of the NOVA Building complex include, but is not limited to its: - location on adjacent corner lots at the intersection of 7th Street SW and 7th Avenue SW in the west end of Calgary's urban core; - siting set back from the street with wide public pathways, and rotated 45 degrees to the standard city grid; - landscaping features such as: semi-tropical plantings in the atrium; urban parkettes with mature winter garden plantings complementary to those of Century Gardens; - form, scale, and massing as expressed by its: non-symmetrical eccentric shape

Source: The City of Calgary Inventory of Evaluated Historic Resources, entry 728.

Named building record

Public-domain building facts from Wikidata attached by location. Where a stated height differs from the LiDAR roof, the difference usually reflects spires, screens or datum.

Name: Nexen Building, Calgary
Description: building in Alberta, Canada
Stated height: 152 m (LiDAR roof 157.2 m)
Floors: 37
Opened: 1982
Style: modern architecture
Identifier: Wikidata Q7020873 (CC0)

Assessment history

2 separately assessed accounts sit on this parcel (office condominium units or split accounts). 2026 assessed values range $7.7M to $32.8M, median $20.3M, total $40.5M. Assessed values are The City of Calgary’s taxation figures by roll year, not sale prices or rents; Alberta does not publish transaction prices.

Roll 067243402 (highest-assessed account on the parcel) · Office

Series not charted. The City’s published values for this roll number change by more than half or double between years, which usually signals a re-numbered, split or partially assessed account rather than a market movement. The published figures are listed below without a trend claim.

Published values by roll year

Roll year	Assessed value	Change
2005	$103.3M	—
2006	$145.2M	40.6%
2007	$204.5M	40.8%
2008	$270.1M	32.1%
2009	$254.8M	-5.7%
2010	$228.7M	-10.2%
2011	$154.4M	-32.5%
2012	$172.7M	11.8%
2013	$255.6M	48.0%
2014	$244.7M	-4.3%
2015	$313.5M	28.1%
2016	$290.1M	-7.4%
2017	$248.6M	-14.3%
2018	$176.8M	-28.9%
2019	$75.7M	-57.2%
2020	$51.9M	-31.5%
2021	$47.7M	-8.1%
2022	$42.3M	-11.3%
2023	$38.0M	-10.2%
2024	$34.7M	-8.7%
2025	$34.8M	0.3%
2026	$32.8M	-5.9%

Development and building permits

Applications the City has located on this parcel since 2012, from the Development Permits and Building Permits datasets.

Recent development permits 12 since 2012

Applied	Permit	Category · description	Status
2019-01-29	DP2019-0428	Change of Use - Permitted Use CHANGE OF USE: OFFICE (USE OF PUBLIC EASEMENT SPACE)	Cancelled
2018-08-09	DP2018-3785	Signs - Permitted Use NEW: SIGN - CLASS B (FASCIA SIGN)	Released Approval
2018-03-07	DP2018-0890	Change of Use - Permitted Use CHANGE OF USE: CONVENIENCE FOOD STORE	Released Approval
2017-10-03	DP2017-4507	Change of Use - Permitted Use CHANGE OF USE: OFFICE (USE OF PUBLIC EASEMENT SPACE - 5 YEARS)	Lapsed Approval
2017-10-03	DP2017-4510	Change of Use - Permitted Use CHANGE OF USE: TAKE OUT FOOD SERVICE	Released Approval
2017-09-13	DP2017-4194	Change of Use - Permitted Use CHANGE OF USE: TAKE OUT FOOD SERVICE	Released Approval
2017-09-07	DP2017-4094	Change of Use - Permitted Use CHANGE OF USE: TAKE OUT FOOD SERVICE	Released Approval
2017-09-05	DP2017-4060	Change of Use - Permitted Use CHANGE OF USE: TAKE OUT FOOD SERVICE	Released Approval

Recent building permits 48 since 2012 · 38 in the City’s office class

Applied	Permit	Class · work	Est. cost	Status
2026-04-10	BP2026-05648	3402 - Office · Improvement Interior Alteration	$2.2M	Issued Permit
2025-10-07	BP2025-19649	3402 - Office · Improvement Interior/exterior alterations	$678,325	Issued Permit
2025-08-18	BP2025-16044	3402 - Office · Improvement Interior Alterations	$1.9M	Issued Permit
2024-12-17	BP2024-26038	3402 - Office · Improvement Assembly Interior Alteration	$15.2M	Completed
2024-07-29	BP2024-15494	3402 - Office · Unspecified Fire Alarm Repair	—	Cancelled
2024-06-17	BP2024-12001	3402 - Office · Improvement Exterior Alteration	$25,000	Completed
2024-01-22	BP2024-01088	3402 - Office · Improvement 801 Seventh Reimagined	$5.6M	Completed
2024-01-12	BP2024-00636	3402 - Office · Improvement Interior Demolition of Lobby and Plus 15 Levels	$360,000	Completed

Declared estimated project cost across all 48 non-residential building permits on the parcel since 2012: $48.7M. Permit descriptions are the City’s records at retrieval; applicant and contractor names are not reproduced.

Nearby office buildings

The six nearest office building sites in the record, by straight-line distance between parcel centroids.

667 7 St SW18.2 m · built 1979 · Office · 2 accounts · Downtown Commercial Core · 81 m
816 7 Ave SW31 m · built 1965 · Office · Downtown Commercial Core · 84 m
815 8 Ave SW55.7 m · built 1981 · Office · Downtown Commercial Core · 89 m
840 7 Ave SW74 m · built 1977 · Office · Downtown Commercial Core · 98 m
734 7 Ave SW73.7 m · built 1982 · Office · Downtown Commercial Core · 111 m
801 6 Ave SW115.8 m · built 1982 · Office · Downtown Commercial Core · 125 m

Nexen Building, Calgary questions

Answers drawn from the record.

How tall is Nexen Building, Calgary?

The main structure on the parcel has a LiDAR roof height of 157.2 m in The City of Calgary’s 3D building data, a storey-equivalent of about 40 at 3.9 m per storey. Wikidata records an architectural height of 152 m. Wikidata records 37 floors.

When was Nexen Building, Calgary built?

The City’s assessment roll records 1979 as the year of construction. Wikidata records 1982 as the opening year. The heritage inventory records 1979.

Which CTrain station is closest to Nexen Building, Calgary?

8th Street SW Station, 66 m in a straight line from the parcel centroid.

Is office space available at Nexen Building, Calgary?

This profile is built from public records and does not track availability, rents or tenancy. Submit a private requirement and current options in the building or nearby will be confirmed through Commercially.

Open in 3D Downtown Commercial Core office buildings Calgary office space guide Downtown map Skyline Office lease cost guide Office tour checklist

Public record sources: Current Year Property Assessments (Parcel), Historical Property Assessments (Parcel), Assessment Subproperty Use Codes, 3D Buildings - Citywide (LiDAR roof outlines), Land Use Districts, Transit LRT Stations, Green Line Stations, Plus 15, Historic Resource (Inventory of Evaluated Historic Resources), Development Permits, Building Permits, Calgary Existing Buildings - Performance Metrics (BenchmarkYYC) — The City of Calgary, retrieved 2026-09-21. Contains information licensed under the Open Government Licence – City of Calgary. Building names, floor counts and architects, where shown, come from Wikidata (CC0). No brokerage, listing-data or commercial research source is used.

Boundary: Assessed values are the City’s assessment-roll figures for taxation and are not sale prices, asking rents, vacancy or availability; Alberta does not publish transaction prices. LiDAR heights are roof-surface elevations above the lowest ground point at the building perimeter and can differ from architectural heights. Storey equivalents are derived at 3.9 m per storey and are not floor counts. Distances are straight-line. Permit descriptions are the City’s records at retrieval and do not establish current use, tenancy or availability. Read the methodology.

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