"拆除费用" most equal the money you buy the old house. First of all you need to get permission from the city. Without it , you can do nothing. The best way is that you find a empty land and build your desire home. In this case it is always run over the budget. $500.000 budget house run to 800.000 is very normal. If you have big cash on hand, you can do anything. Otherwise, forget it.