Home Improvement Questions? Ask a Handyman for Answers ASAP
To support the whole load on something that is 27' long on only the outer block wall is going to require that the block wall not be involved in the picture. 25,000 pounds is just too much weight for the block wall alone to bear as well as the wall loads that it also must handle.
What you are going to have to do is pour footings on the exterior of the home of sufficient size to carry the load.
Th footings will require a set of post beams (most likely steel I beams) be set into them.
Once this is done the beam that supports thew actual load can be moved into place and then either bolted or welded into its final position.
Ok I am sure that you would like for me to tell you what size the beams and footings are.
Unfortunately I can not. This is a job that a qualified structural engineer will have to do.
Now mind you this is not because I can't tell you the size beam you will need as I have worked as a steel fitter, millwright, and a carpenter. All of these jobs require that you know something about how much weight a member can withstand.
The problem comes in with the fact that I can not see the actual structure. I have no idea what type of soil you have, or quite a few more things that would be required to form a proper assessment of the job as a whole. Not to mention that it would be illegal for me to give this advice with out an engineers certificate.
Best advice: Consult with a structural engineer in your local area.
FYI, a 1" x 10" x 8" steel I-beam will hold the load. Gussets may be required near the center to prevent twisting.
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Here is a quicky sketch of what I'm talking about. Show it to the engineer. Im sure he will agree that it is a viable method to accomplish what you want.
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Best regards; The Home Smithy