How long do concrete - steel constructions last in time ? Does anyone know ? For example how long would the buildings (skyscrapers and even the normal 2 floor buildings) in NYC last without any further maintenance ? 200 or 1,000 years ? And more in general how long can we expect concrete - steel buildings to last of any type, even one or two story buildings ? How long can wood frame homes last as is usual in suburbs of the US ? Is a wood home of 100 years old almost finished as far as lifetime goes ? Can they last more than 100 years ? Thanks if anyone has any ideas. And at what point is maintenance costs higher than just tearing down the buildings and building a new one ?