In a way, the TTC is already in the real estate business by renting out shops at some subway stations (Islington, Warden, Eglinton, Bathurst and Finch are some that come to mind). Unfortunately much of the retail isn't very attractive (the most attractive being the Tim Hortons at Finch Station), and many being of the thrift shop, truck stop-cafe variety. I think one way that TTC could improve on this is by renovating existing retail spaces to attract better tenants, and to develop mini-PATH systems (or extensions of PATH) at major stations that would include more retail units, while at the same time creating more extensive pedestrian tunnel networks that would allow one station to cover a much greater network than it has now.
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299's words of caution are quite valid. Not only is the real estate situation in HK much different from Toronto, the transit situation is also very different from Toronto. MTR operates a small network (relative to other major world cities) on the strips of land between the mountain and the sea (north Hong Kong Island and the Kowloon Peninsula) where much of the city is developed. HK also has a much different commuting pattern from Toronto- whereas most GTA commuters use transit just to get to and from work/school every weekday and then for nothing else, in HK many people do not head home right after work or school - they go out to eat, go shopping, hang out with friends in the evening (where most stores stay open up to 10pm or later), and they need transit to get around. Same deal on weekends. It is not surprising that MTR subway trains are usually still packed at 10pm on weeknights and all weekend.
The MTR literally sits on a cash cow that allows it to operate with minimal subsidies even if it does not develop real estate.
Other points of difference between the MTR and the TTC:
- It has the Octopus Card smart card which allows it to easily change its distance-based fare structure for more profit (and sometimes even allows it to secretly add surcharges to fares - its platform screen doors installation program was funded by a surcharge on the Octopus Card that most passengers didn't know about until the installation was complete)
- Except for a small network of feeder buses (and aside from a suburban LRT system), the MTR does not operate an extensive surface vehicle network like the TTC
- The MTR is a publicly-traded company after privatization (with the HK government being the controlling shareholder).
- In recent years other cities have contracted out subway operations services to the MTR, including Beijing, Shenzhen, Shanghai, Hangzhou in China, the London Overground and soon, the Stockholm Metro (and in the future, the Mumbai Metro). MTR was a failed bidder to build-operate Vancouver's Canada Line. I'm sure that if Toronto contracts out its subway service, the MTR would be one of the bidders.