Tell me buying a triplex that is 150yrs old is a good thing

[Patrick Gibson]

Currently have a 3 unit triplex under contract in WI that was built in 1865. Will cash flow great, but what reservations should I have purely based on age of the structure? I'm from southern CA and have a good PM that is managing another multi-family. She doesn't see an issue, but I just wonder....Any feedback to help me cope with my concerns would be fantastic.