I had an aunt who lived in a house that was built in 1923 and its detached garage was also built in 1923. I am in the process of fixing up both this house and the garage before the house is put for sale on the housing market.
All the outer walls of the garage are brick, and all four walls look solid, I have not found any major cracks or bowing in these walls and the garage floor still looks to be in good condition. There is a 8" x 8" x 8' wooden vertical post that is supporting a 12" x 8" x 17' wooden support beam, which is made up of two pieces (this is shown in the third picture below).
One end of this support beam rests on top of a brick support built up along one wall of the garage, and the other end of the support beam rests on top of an interior brick wall, which separates the garage into two sections. I'm not sure what kind of wood was used for the post and for the support beam.
There are some cracks that run down the middle of this vertical post (see pictures below), and these cracks are wider towards the bottom of the post. I am wondering if these cracks are a sign that the whole post has been splitting apart over time and that it is no longer structurally sound. If so, I am wondering if this means that the structural integrity of the whole garage is no longer structurally sound, and if this means that the garage cannot be sold as is.
The pictures below shows the vertical post and the support beam from different angles. The two arrows in the first picture point out the cracks that I am concerned with.
Should I be concerned about the structural integrity of this 100-year-old garage?
Also, if this vertical post needs to be replaced, I am curious about what kind of company/contractor that I will need to hire to replace this post, or perhaps just to reinforce it. I am a computer technician by trade so I know very little about the home/garage construction business and who specializes in making these types of repairs.