text: City of Toronto open data for addresses and road centrelines indicates that the name of the street is "St Helen's" with an apostrophe. Geobase has "St Helens" with no apostrophe. Apostrophe also seems confirmed by sign at Bloor in 2017 and 2018: https://www.mapillary.com/map/im/mM6VZNk1kt5hVaXlznoPTg and https://www.mapillary.com/map/im/JIs0-WeuhxILshACrc3u7w
  
  Canada Post has addresses as "287 SAINT HELENS AVE" with no apostrophe.
  
  A sign for the stretch at College had no apostrophe in 2016: https://www.mapillary.com/map/im/LIB0XlzeDO9qgb13RFf-Ow but I couldn't find a more recent good photo for that stretch on Mapillary.
  
  Does anyone have any secret insider knowledge here? Are there any more street name signs posted?