People Design Co-op's architecture studio is located on the second floor of a former bank building. They work with non-profit and public housing providers, social service providers and community land trusts to retrofit and develop affordable housing stock. The City has identified this property through the 2014 Leslieville Planning Study as significant for its prominent location and its unique typology.

The Polish Combatants' Association Branch 20, a non-profit organization founded in 1948, is dedicated to honouring the memory of Polish veterans and promoting Polish history, culture and language. The three-storey building includes an underground parking lot, offices, a dining room, banquet hall and military museum. The building has a rich history and holds great meaning for the Polish-Canadian community.

Celebrating 20 years, Q4 Architects is the largest woman-owned and -led architectural firm in Canada. They are focused on designing residential and mixed-use projects with a sense of dignity, at all levels of affordability. This studio is perched above the West Don River, with sweeping views of the ravine. Come and explore the studio's boardrooms, creative studio and collaboration spaces.

Constructed in the 1930s, this popular Doors Open site is Toronto’s largest water treatment plant, providing 400 million litres of safe drinking water daily. It’s also the largest ensemble of art deco structures in the city. Take a self-guided tour and explore the pump house and filter building, with staff available to answer questions along the way. (No tripods/filming allowed.) (Photo: Samuel Kolber)

RAW Design's new office showcases the firm's dedication to adaptive reuse and sustainable design. Originally a one-storey mechanic’s garage, the building has been transformed into a two-storey structure featuring timber construction. The newly added second floor houses RAW's office, while the ground floor remains a vibrant commercial space. This project highlights RAW's innovative approach to creating functional and community-focused architecture.

RCLUB is reinventing the car club. Located in midtown Toronto, this clubhouse is more than just a social club. Members visit to catch up with friends, connect with clients, work on or wash their cars, or hit the virtual track on top-notch driving simulators. While the love of cars is shared, the incredible community is what makes RCLUB special.

One of Canada's oldest architectural practices, RDH Architects specializes in architecture for the public realm. The firm recently relocated to a heritage building, where they blended historical features with contemporary design. Highlights include a glazed front façade with views into the studio's creative process, a spiral staircase, and an open-plan interior with 28 workstations, meeting spaces and a collaboration bar.

Redpath Sugar began in Canada in 1854 and has been operating in Toronto since 1959. As one of the last industrial establishments in the Toronto Harbour, Redpath remains a vital part of the community. Explore the site, engage with employees, interact with historical artifacts and enjoy a treat or two along the way. Entrance will be through the Centre Gate.

RevelHouse is a unique architecture practice in the Toronto market. They focus on what they've coined "social architecture," which encompasses attractions, mixed-use projects and even multi-family residential spaces. Clients have included Cineplex, Mattel, the NBA, Splitsville and Pickleplex. During Doors Open, come and see work from across the globe and discuss how “social architecture” contributes to create compelling spaces.

Built in 1914 as a silent-picture theatre, this three-storey building has been revitalized into an environmentally sustainable hub that offers accessible programming and arts initiatives centred around marginalized BIPOC communities. Retaining the building's original heritage and charm, the restoration highlights exposed brick and wooden posts. Featured in this green building is a restaurant, rooftop garden, co-working areas and galleries/event spaces.

Rosedale United’s sanctuary, with its pointed arches and vaulted ceilings, draws the eye upward, creating a sense of height and grandeur. The vibrant stained-glass windows fill the space with ethereal light, enhancing its spiritual atmosphere. The sanctuary also has excellent acoustics, as demonstrated by their Casavant organ’s rich, resonant tones. Restored in 2005, the organ now boasts 2,637 pipes.

Scadding Cabin, Toronto's oldest surviving building, was built for John Scadding, John Graves Simcoe’s assistant. This one-room house was acquired by the York Pioneers in 1879 and rebuilt on its present site in time for the inauguration of the Toronto Industrial Exhibition (now the Canadian National Exhibition). This is recognized as the earliest act of architectural preservation in Toronto.

Nestled in Thomson Park are four heritage buildings that comprise the Scarborough Museum. Hear stories, old and new, that have shaped the ever-changing community of Scarborough. Explore the McCowan Log House, Cornell House and the Hough Carriage Works. Learn how Scarborough developed from land farmed by Indigenous peoples and European settlers into a major suburb of North America's fourth-largest city.

The Second City is the largest improvisational comedy theatre and training centre in Canada. Its list of famous alumni includes John Candy, Eugene Levy, Catherine O'Hara, Martin Short, Dan Aykroyd, Andrea Martin and many others. In June, they celebrate 50 Years of Funny. During your self-guided tour, knowledgeable volunteers and staff will be available to answer questions. Bring your camera! (No tripods allowed.)

Come and tour Spadina House and discover the home of the Austin family from 1866-1982. Period rooms contain furniture and decorative details from the 1920s and 1930s. Co-owned by the Ontario Heritage Trust and the City of Toronto, this site includes three floors, an orchard and the newly created Aki Wiidookaagewin "Ontario Earth Helpers" Indigenous kitchen garden. (No tripods allowed.)

Located inside Metro Hall, Spin Master boasts a colourful and welcoming reception area, anchored by a video wall that introduces you to this children's entertainment company — showcasing some of its hits, from PAW Patrol to Unicorn Academy. Visitors can explore artifacts, get their hands in “kinetic sand” and visit the Playground Café with a mural that features the word "PLAY."

St. George's Hall is a Toronto landmark. Built in 1891 by the St. George's Society, the building has been home to the Arts & Letters Club of Toronto since 1920, a private club formed in 1908, a social club centred on the arts. Founding members include Group of Seven painters, Robertson Davies, Vincent Massey, Marshall McLuhan, Mavor Moore and others.

St. Andrew by-the-Lake Anglican Church is a lovely neo-Gothic wood-framed church surrounded by parkland and lagoons on Toronto Island. It holds services year-round on Sunday mornings. The building has beautiful acoustics and some stunning stained-glass windows. St. Andrew's is the last remaining church on Toronto Island and will celebrate its 141st anniversary this year.

A synagogue until 1937, St. George’s Greek Orthodox Church stands as a dynamic affirmation of the spiritual and artistic achievement of the Byzantine religious tradition. Except for its Romanesque façade and a few Moorish capitals, the renovated structure is now more thoroughly Byzantine in its layout and esthetic décor. The church interior has been entirely painted by master iconographers.

St. George's on-the-Hill has been a landmark in Etobicoke for 180 years. Built in 1847, the church building has undergone many renovations but still incorporates the original structure in the centre of its worship space. Highlights include many stained-glass windows (including the modern "Children of the Bible" window), a Casavant pipe organ, an 1865 font and the parish's small cemetery.

The Chapel of St. James-the-Less is a mid-19th-century Victorian Gothic revival funeral chapel that is picturesquely set atop a small, landscaped knoll just inside the main gates of Toronto’s St. James’ Cemetery. Designed by Cumberland and Storm, it was designated a National Historic Site in 1990. It is enhanced by its elevated position, surrounded by the peaceful cemetery.

St. Lawrence Market is a premier culinary destination, celebrating the best of Toronto's rich food and community heritage. The newly redeveloped North Building is the historical home of the Saturday Farmers’ Market — a cornerstone of the Market's heritage since 1803. The North Market also hosts a diverse range of events, a new café, the Toronto Court Services and multi-level parking.

Built in 1955, this church is recognized as Canada’s first mid-century modern sacred structure. Constructed by Estonian refugees forced to leave Europe during the Second World War, the church maintains their social, linguistic and cultural ties. The 1972 addition and alterations were based on the original design. During Doors Open, enjoy organ concerts accompanied by a male choir.

This mental health charity turns an outdated candy factory into a modern, welcoming facility for teens and young adults to access mental health services. Understanding how the built environment influences health and well-being, the architect’s young design team worked directly with participants, counsellors and staff. Explore this site and see what architectural elements have been retained from the original structure.

Terroni’s Adelaide location is part of Toronto’s history. Built in 1852, it housed the York County Court House. Today, it has been converted into a popular Italian restaurant with dramatic columns, a spectacular dining room with fireplaces and a sunlit atrium. Throughout the restaurant, see antique Sicilian puppets on the walls, handcrafted by local artists over 200 years ago.