(1)  older, mixed-use neighborhoods are more valuable.  (2)  young & talented people love old buildings.  (3) nightlife is more vibrant on streets.  (4)  more cultural outlets.  (5)  older business districts offer greater opportunities for entrepreneurship, including women & minorities.  (6)  older, smaller buildings support the local economy with more non-chain, locally owned businesses.  (7)  older businesses have more businesses per commercial square footage.  There can be a fixture of old and new also.  Interesting for folks in cities, but also SMALL CITIES like Tyler and that is happening in TYLER, TX.