It cost £260,000 to build in 1889
9000$
The Stratosphere Tower, now known as the The Strat, cost $32 million to build. It was completed in 1996 and stands at a height of 1,149 feet, making it the tallest freestanding observation tower in the United States.
Eiffel Tower cost 7,799,401.31 French gold francs in 1889
1p
£138.1 million
The Sky Tower cost $50 Million (USD) which is $75 Million (NZD)
a lot of money
50 billion pounds
The Sears Tower was renamed Willis Tower on July 16, 2009. I'm not sure how much it would cost to build today but I know it is worth over $1 Billion USD today.
USD 100 million
totally no idea