Use Multiple CPA's - How and Why

[Pierre E.]

What is the best way to go about using multiple CPA's? Why I ask? Lets say you have a W2 job, a non real estate specialized business with your spouse (pass through income), and own a few rentals. You value expertise of a CPA in your business niche, but are limited on real estate related tax situations and vice versa. (check out Amanda and Matts tax book, even regular CPAs use REI CPA's for investing).

Should you use the CPA that applies to the most complex aspect of your taxes and only that one?  How do CPA's feel knowing you use another CPA either one time or continually? Can they work together? Who does the official filing of your taxes?  Does one do one part and then send documents to the other? 

What's the best ... etiquette in creating and managing these CPA relationships but making sure you get the best tax advice and strategy for your situation?  

Would love perspectives of both investors in this kind of situation, and CPA's on this!