Getting a primary residence mortgage at an investor-friendly bank

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I was listening to an old BP podcast recently and heard what I thought was an interesting tip: get your personal mortgage at a local portfolio lender as a way to establish a relationship that can be leveraged for future investment lending. The guest shared that in his opinion paying an extra quarter of a percent was worth the price of building a relationship with a lender.

Has anyone tried this in the Puget Sound region? 

Thanks!