I would check with the blind supplier as well as the building engineer. I'd be hesitant drilling into surface A.

@Windows on Washington Ltd Where would you typically mount a shade on this type of window frame?

We don't do much high rise so I would try to reach out to the building engineer.

Ceiling would be the perfect answer but I agree you need to check first If you have the space to do the individual blinds maybe just use solar shades that allow you to keep the view but control the heat and UV and forget the motorized I leave mine down all summer and when the heat is gone I just roll them up not such a big deal and BTW single solar shdes are not horribly expensive I use Steves blinds for my clients no issues The other thing I will mention is the darker the solar shade the better the view so I use 10% and in either charcoal or bronze depending on your color scheme

I would imagine that there are MANY residents in this building who have installed motorized blinds. Consequently, speaking with the building’s management/maintenance people, etc. will generate options for installation. (In addition to the suggested engineer.). WOW what a view!

Thanks for the responses, these are very helpful. We'll see if we can track down the "building engineer", but I'm not sure how likely we are to find someone who can tell us where to mount the blinds. But the idea of trying to see what others in the building have done is certainly a good one, there are many units there with blinds installed.

@Patricia Colwell Consulting good tip about the solar shades - would those work for both glare control (the TV is facing the west windows) and solar heat gain control?

@ptreckel yes, the view is fantastic, so we definitely want to get the shades right!

If you mount to surface "A" you'll have a privacy gap on the sides where there is nothing to bridge the gap between the shade cloth and the edge of the window opening. The gap would be directly over glass.