Thinking aristocratic Europe lavish (though not French Louis the XIV lavish) and yes I'll be putting visual references and descriptions in for you.
For how the building looks on the outside think:
And think of the hallway as entrancepoint >>> a corridor (the narrower bit of the hall leading into a rounderroom and staircase (hallway's end)
The room is less cramped as this one, but you'll get the idea and a rounder wider staircase one which you can stand side to side with at least three people in width.
Ground Floor is the Great Hall, Offices and the Music and Study room. With the Kitchens and Servants quarters in the back of the building.
First floor the Main appartment rooms; guests are welcomed here, the Diningroom is there as well as 'the Men's Playroom' which is filled with guns, billiards, globes cigars and liquor. Of course there is also the Gallery and Ballroom and Dressingroom
Second Floor are the Private Quarters; the Bedrooms and the 'Skyroom' or Observatory for all the Citygazing and Sky watching ones desires.
As said this is their Townhouse, their 'Real Estate' is a proper place outside in the country, with lands and tennants and all that. It is also where Tyr himself prefers to be since it is far away from meddling mother's trying to string him as a husband for their potential daughters.
They are aristocratic landed gentry, meaning they have a title (Tyr's proper title explained to Tobias) and lands to go with said title (officially though Tyr's Uncle is the real Lord Venray).
As he is the eldest, but he passed his inheritance on to his younger brother as his ambitions lay elsewhere when he became a Knight and had no time to spare taking proper care of the estate and its business.