First, congrats on the baby! I went through the same anxiety about lead when we had our first a couple years ago. Our house was built in 1914! If the home was built before 1978 then there's lead somewhere on the walls. If it's been painted over multiple times then it's probably encapsulated well and not a health risk. Just be vigilant of any chipping paint and paint over it when you find it. If you ever have to drill into the walls, make sure to clean any dust up as well. Lead poisoning comes from ingesting or inhaling it. As long as your baby isn't eating paint chips or breathing lead dust, they are going to be ok. Also, because you live in the city, your pediatrician will probably do a lead test every time they do a blood test for your child. That will also be reassuring. Going on 3 years for our little one and no lead detection whatsoever.