St. Catharines, ON · · MLS® X12596884Updated
$10/sq ft/yr
55 King St #300 is an office in St. Catharines, for rent at $10/sq ft/year.
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Multiple turnkey office spaces available in this well-located downtown professional building. Suites range from approximately 500 sf up to full floors of 9,500 sf, offering excellent flexibility for growing businesses. Tenants will benefit from abundant natural light provided by large perimeter windows and a good tenant mix within the building. Ample parking on site and at nearby lots. Landlord will build to suit, with additional leasehold incentives available. Net lease structure includes all utilities and janitorial service in the TMI. The location places your business in the heart of the city core, surrounded by banking, legal and municipal functions, convenient transit, restaurants and retail amenities.
St. Catharines office for rent at $10/sq ft/year — book a tour to see if it fits your search.
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Closed sales on the TRREB MLS®.
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Listing brokerage: BLAIR BLANCHARD STAPLETON LIMITED, BrokerageMLS® X12596884 · Listing data last updated
Listing data comes from the Toronto Regional Real Estate Board (TRREB) and is deemed reliable but not guaranteed. Shown on Summitly by Coldwell Banker Summit Realty, Brokerage, which is not the listing brokerage. The information provided herein must only be used by consumers that have a bona fide interest in the purchase, sale, or lease of real estate and may not be used for any commercial purpose or any other purpose. © 2026 Toronto Regional Real Estate Board. All rights reserved.
Mortgage financing is arranged through Mortgage Squad Advisors. Summitly is the technology platform that powers this site. Estimated values, AI insights, calculator results, and rental projections shown on this page are generated by Summitly and are not provided by, reviewed by, or sourced from TRREB, the MLS®, or the listing brokerage; they are not appraisals or opinions of value. The trademarks REALTOR®, REALTORS®, and the REALTOR® logo are controlled by the Canadian Real Estate Association (CREA) and identify real estate professionals who are members of CREA. The Coldwell Banker® name and logo are trademarks of Coldwell Banker Real Estate LLC.
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55 King St #300 is listed for rent at $10 per sq ft per year (MLS® X12596884). Summitly updates the rent as soon as the MLS® record changes.
The listing for 55 King St #300 doesn't publish its bedroom and bathroom count. It is a commercial property in St. Catharines.
The nearest rapid-transit station is St. Catharines GO Station (Lakeshore West GO), about 2.1 km in a straight line. Distances are straight-line, not walking routes; check the transit agency for routes and schedules.
Summitly has no earlier MLS® sale or lease of 55 King St #300 on record from the last two years. Older records aren't shown under TRREB rules.
55 King St #300 is in St. Catharines, ON. Schools, transit, parks and shops nearby are under Location & lifestyle on this page.
331 days — 55 King St #300 was listed on December 3, 2025.
Select "Book a viewing" on this page and pick a time. A licensed Coldwell Banker Summit Realty, Brokerage agent confirms it with the listing brokerage, then helps you put together your rental application.
The listing for 55 King St #300 doesn't publish the annual property tax. The property tax calculator linked at the foot of this page gives an estimate for St. Catharines.
The listing for 55 King St #300 doesn't publish a year built. A Summitly agent can ask the listing brokerage for it.
