Here "house" represents a temple. (See: [[rc://en/ta/man/translate/figs-metonymy]])
# seventy pieces of silver
This means seventy shekels of silver. A shekel weighs 11 grams. If it is necessary to translate this with modern measurements, you can translate it like this. AT: "almost one kilo of silver" (See: [[rc://en/ta/man/translate/translate-bmoney]])