It's mighty hard to prove that a building has never contained a basement. It could be constructed in secret, used, and then filled in. You'd need to dig it up l

It's mighty hard to prove that a building has never contained a basement. It could be constructed in secret, used, and then filled in. You'd need to dig it up like an archaeologist would, examining layers of soil for signs of disturbance. More realistically though, the pizzeria was a codeword for the real location. Plenty of evidence for pizza-related codewords is in the Podesta emails. It's really creepy. Normal people don't rent specific numbers of slices of pizza for specific numbers of hours. It is widely thought that the number of slices is actually the age of the victim. Pizza-related codewords are known to be used by criminals involved in that sort of thing; some have been caught. Podesta also has some disturbing artwork in his home that features children.