Do you have a specific structure in mind? Maybe something local to you? You can go walk it down and measure it (with permission of course if its private property). Then using MikeCT's reply convert to O Scale. Next, you probably wont be able to fit it on your layout so you use "selective compression". You simply reduce it's size equally on all sides, or at least two sides at a time, until it fits, or "looks right". If youre working from photos and a personal visit is not feasible, look for something in the photo of a known or estimated length. I recently found a pic of a freight house i want to model with a ladder hanging horizontally on hooks on a wall. i can now estimate the building's length using the typical rung spacing of the ladder. You can also use a commercially produced model to compare what you want to build to and get an idea of a "look right" size. Have fun!
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