Another that list misses is that houses must be reachable by street at all. My girlfriend 20 years ago had an address on a canal (though the back of her house w

Another that list misses is that houses must be reachable by street at all. My girlfriend 20 years ago had an address on a canal (though the back of her house was reachable by unnamed alleyways). The thing about postal databases bit me many times being the first owner of a new home, too. So many times some software system didn't believe my address was valid because my builder filed the original deed incorrectly. Actually, this was worse because I couldn't even pay property tax for three years until it was fixed, but believe me software service X that told me my address didn't exist, my house is real and every delivery service I have ever tried to use managed to find it.