It’s a very old book.
Maybe your local library has it...or can request it for you?
I’ll try ABE Books. I have the Luchow’s cookbook!
I went looking, but can’t find an actual Sardi’s cookbook - though there are books *about* Sardi’s, and references to particular recipes. I found this beautiful dessert, ‘Boccone Dolce’ (link references a book by Mary and Vincent Price which I’ve also been hoping to run across in my thrift stores, and which contains recipes from many famous restaurants):