They're building the new Transbay Tower in SF on soft ground. It just means they had to put in a bunch of very deep piles and a foundation that constituted one

They're building the new Transbay Tower in SF on soft ground. It just means they had to put in a bunch of very deep piles and a foundation that constituted one of the largest concrete pours of all time. But the real estate market is such that they were happy to do it, in exchange for permission to build the tallest building in the city.