Our fifty year old house back home was 1,000 square feet, and sold for $395K. I almost felt ashamed accepting that offer. There's no way in hell that house was worth that.
Your old house is worth over $600k now for sure.
Check out your old neighborhoods here on realtor.com or trulia. It’s shocking, really. My dad bought his house in the 1960s for $20k and people thought that was too much. It’s worth $2m now (on an acre which is kind of rare in LA).
By the way, Rockwall was gorgeous. My dearest friend who moved there had terminal cancer and has passed. Their house which to us was practically free had like 6 bedrooms and 3 levels, and wasn’t anywhere near one of the fancier homes.