My husband and I just bought a home that was built in 1931. Before purchasing the home it was noted that the house had settled over the years. It really wasn't noticeable except in the entry way of the dinning room, sagged toward the center of the home. When the inspector came he said this was common for the age of the home, plus a support beam was added to the basement. It past inspection from a highly acclaimed inspector in our area and didn't find it concerning. But after living in the home for a month now I have noticed the main staircase slants toward the sag and the baseboard is separating from the plaster where it's slanting towards. I'm not overly concerned about but in the future I would like to work on the staircase b/c this very creaky! May question is what could have caused this and should I be concerned?