I believe the polygon count is too high. It has 23668.
I was able to decimate it to 21597 and it loads fine. (I didn't have a texture, of course, so I just threw a random one on it, looks kinda silly. Also, any UV mapping was lost)
I think your best bet, though, would be to separate those statues inside into individual objects. While I don't know how many polygons that would save on the building, it should be enough to bring it under 22,000
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