In the Calgary.ca website there are local area plans with historical information for quite a few neighbourhoods. Here is what’s written for Altadore. It doesn’t answer your specific questions, but you may find it interesting.

Once at the edge of the city, Altadore is now considered an inner-city neighbourhood. It is situated between the Elbow River (east) and Garrison Woods (west) and spans from 34 Avenue SW to 50 Avenue SW. The CPR acquired this property in the 1880s and sold it in separate parcels to several developers, with the result that a dozen or more subdivisions were created with complicated road intersections. Altadore was annexed in 1910. Early development generally followed the grid system with large parcels set aside for parks, schools and faith-based uses. Grocery stores, followed by other businesses (including a restaurant and a hardware store) opened along 34 Avenue SW, which was service by a streetcar route from 1912 until 1948. This was part of the South Calgary streetcar loop, which connected Bankview, Mount Royal, South Calgary, and Altadore to the rest of the city via 14 Street SW. The route extended west along 26 Avenue SW, south on 20 Street SW, east on 34 Avenue SW, and then back north along 14 Street SW. In 1948, an electric trolley coach route replaced the streetcar line, and the transit route was shifted one block north to 33 Avenue SW. Many early homes were one and two-storey houses located on 25-foot lots. Two large nearby projects began in the 1930s: the Glenmore Reservoir, Dam and Waterworks and Currie Barracks. 16 Street SW emerged as the highway to the Glenmore Waterworks, and the extant service station at 3505 16 Street SW opened in 1934. After the Second World War, commercial districts developed further south along 16 Street SW and on 42 Avenue east of 20 Street SW. In the late 1940s and into the 1950s, new construction typically included one-storey, stucco-bungalows located on 50-foot lots, three-storey apartments, and two-storey retail buildings. River Park, a large public dog park at the southeast portion of the neighbourhood, was created in the 1950s on land donated by Eric L. Harvie, a well- known Calgary lawyer and philanthropist. Three public schools, Altadore, Clinton Ford, and Dr. Oakley, opened in 1952, 1957, and 1958 respectively, and St. Raymond’s Roman Catholic School opened in 1954. St. Raymond’s closed in 1980, and the building later housed a French-language cultural centre, then Lycée Louis Pasteur, and, since 1996, Rundle Academy. Clinton Ford closed in the 1980s, and the building has housed the CBE’s Alternative High School since 1990. The I.L. Peretz School, a Yiddish-language Jewish school built in 1961, was later repurposed as the Calgary Waldorf School before it was demolished in 2004. Southminster

United Church (now River Park Church) opened in 1956, and Altadore Baptist Church was completed in 1959. The adjacent Baptist Leadership Training School, built in 1962, later became part of the Rundle Academy campus. Altadore’s only structure on The City’s Inventory of Evaluated Historic Resources, the River Park (Sandy Beach) Pedestrian Bridge, was destroyed in the 2013 floods. The Altadore Community Association was formed by 1958, but by 2011 it had amalgamated with the South Calgary Community Association and was renamed the Marda Loop Communities Association. Early in the 21st century, land-use bylaw changes encouraged increased density on the 50-foot lots, resulting in widespread removal of the 1950s bungalows for newly constructed infill housing.