Hi,
I have been developing games, VR/AR apps and simulations in Unity 3D since past two years! You should first checkout the reviews I have got from my previous clients :) You will also get an idea that I have worked on many VR projects in the past :)
Well, about this project, I know what exactly you need! Just need to know one thing! The walk though, we can set it directly, means user will automatically move inside the penthouse at different locations or we can give an user a options to move everywhere in penthouse by selecting few options.
Can you please contact me so I can explain you both ways with some example!
I personally like VR projects, I am looking forward to work on this project.
Thanks for your time :)