[flother]

The article says it traces the “oldest intact building in each US state”. Wikipedia says that only a “portion of the structure [the Pirates’ House] was built in 1734”. It sounds like the latter doesn’t match their definition.

[chasing]

I'm not sure what their criteria is, as the part of the Alamo in their image was started in 1744 and never actually completed. (Depending on your definition of "completed," I suppose.)

[megaman22]

The article isn't consistent, either - some of these are mentioned as having been jacked up and moved several times, whereas other claim to be the oldest building in the state on the same foundation, some are heavily reconstructed.

[heartbreak]

Same with the Jamestown church for Virginia, where only the bell tower has stood since the 17th century.

[dboreham]

Except the listing for Montana is a ruin.