Do we still think 800 metres is magic somehow?
Some recent research to suggest otherwise:
https://www.greenstreetadvisors.com/insights/featured-insights/entry/the-transportation-revolution
I don't think the question in any case is whether there is some benefit to being close to a well-maintained, well-lit, safe and useful station; the question is how much of a premium should you be willing to pay and how much will that premium increase in the future. It's not really very useful to say buy 800m from a station. You pay more for it, everyone knows there is a station. It is not a sufficient driver on its own, you need lots of other pieces to make it successful (local neighbourhood amenities, pride of ownership, outdoor amenities, development controls).
In Edmonton, I'm not sure the new line is really going to do much to help property actual transportation usefulness. Employment nodes are located all around the city and most jobs are not downtown. There is also no real driver to ever go downtown Edmonton except to go to a concert. Plus, the last mile problem is really exacerbated in super-sprawl cities like Edmonton. Not owning a car doesn't make practical or financial sense.
In Edmonton, the LRT spurred a lot of development along 75 street industrial corridor, which has been the best effect I've seen so far in my estimation. That is a great corridor, but I don't really see how the LRT improves that in any material way. Edmonton will be car dependent far out into the future and while the LRT can have a minor role in moving people, cars - or ridesharing will be the way of the future.
A bit of a different story in Calgary as downtown is a major employer and both residential and office growth will focus there into the future. The condo market (while oversupplied) is also different, and there is a much more willing capacity to buy condo product. It is a lot further down the live-work-play pipeline that Edmonton, you will definitely notice it in the $PSF prices for condos in Edmonton vs. Calgary. The main tenant of value is not how far you are to the station - but why is the price you pay for that location going to increase in attractiveness. If you are close to a station but that station is across the street from a hairy motel, big box strip mall. That is not desirable. You will get a very different demographic than if you are located in Kilarney for example, where you don't have LRT as accessible but the desirablility is much higher and there is still great car access. With car sharing, the LRT is going to become much less critical as well.