Yes. That's where the guys are which you said I could take out with the katana if I came in from the other side.
But even to get to the cable car you need to either go past the front of Yuki's suite or past the kitchen door and Dex's suite. All directions have multiple NPCs and enforcers.
If you have some ideas I'd love to know as I think that would be ultra-cool. I did feel a little cheap using a high alert state to "sneak" past NPCs who would otherwise report seeing a ninja. A total stealth route with minimal KOs would be awesome.