This was a large wooden house, built in a fashion of which there are specimens still extant in the streets of our older towns now moss-grown, crumbling to decay, and melancholy at heart with the many sorrowful or joyful occurrences, remembered or forgotten, that have happened and passed away within their dusky chambers.
There are no more uses of "extant" in the book.
Show samples from other sources
But as you know, to do this with extant technology would have been prohibitively expensive for the average person.
Dave Eggers -- The Circle
"That was one of only five extant copies!" he moaned.