That fake baby had more personality than the real Lily. Those 2 babies who portrayed Lily never laughed or smiled. Was like watching ROSEMARY'S BABY in prime time!
I think the Dunphy is a real house because I read somewhere that a few years ago it sold for like $3million or something and when they want to film then they pay the owner a bit to do their bit of filming, although this was back in 2014.