For a standard 20/80 ratio, on that 18% assumption, they just bought out 90% of your prime estate, the other 80 wont matter really, they r not interested in subpar areas.
Just go to an auction full of chinese, ull understand. Those without them, ya well their value is pretty self explainatory. Its an insult if u think they buying power is more than 18%, or even goes up to 30-50% that simply means they r buying up garbage area as well to prop up that %.