Approximate Cost? i am looking into buying an ultra-modern house (about 9,000 square feet),...

i am looking into buying an ultra-modern house (about 9,000 square feet), with an the deep view, on an acre, next to a detached pool house: the house has be on the market for almost a year immediately (bank-owned). However, I want to hire an interior designer to identify my furniture needs for the house and also loose change the disguting metal stairs to marble ones (there are approx. 9 staircases in the house). How much money would it cost for adjectives furnishings, art, marble staircases, and the cost of the interior designer?
How can I tone down brightly painted walls...
Answers:    All you have done is bring up more question like:
How abundant rooms?
How many bed rooms?
How abundant living rooms?
Room sizes?
How many folks do you want to seat at your dining table?
Is here a rec room?
Is there a medium room?
What is in the house presently and is any of it staying?
You said 9 staircases. The cost of the marble would depend on the size and number of stairs. It is sold by the square foot or slab.

I am not a designer, don't know what one would cost, but it sounds like you are taking on a huge project. Good luck.
What are the benefits of solar paneling?
The simple answer, almost 100% more than you think you can afford. This is one of those goings-on that will expand in jargon of money until you say stop.

Decide what you can afford and set a keep a tight rein on. Keep close track of all money commited. Note, I didn't voice spent but commited.