Nashville-based A+ Storage has sold almost half of its local portfolio for $33.6 million. A+ Storage, founded by Tommy Pierce, sold five of its 12 Class A properties to Kurt O'Brien and his national chain, Simply Self Storage. The sale did not involve A+ Storage's headquarters and flagship location, which are in the Gulch. The sale did, however, involve the A+ Storage sites in Franklin, Hermitage, Gallatin, Clarksville and Hendersonville. In total, that's 2,800 units covering almost 350,000 square…