Most places I've heard of allowed up to two.  I don't think that's unreasonable.  Two is often better because they keep each other company, instead of being destructive or noisy. 
 
Edit: My own condo when I had one had this policy as well as many I've visited in the process of interviewing potential adopters of rescue dogs.
		 
		
		
		
		
		
		
		
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