The growing community of Firestone appears to be attracting investor interest, with separate buyers acquiring two retail properties in unrelated deals. Firestone Safeway Marketplace, a shadow-anchored center at 8110-8196 Colorado Blvd., traded for $5 million, or $221.21 per square foot. Another buyer paid $1.78 million – or $819.85 per sf – for a net-leased retail…