This week on Brick Underground, our most popular stories tackled wide-ranging topics— from the problems with HDFC co-ops to gentrification indicators, and to an "only in New York" apartment listing that rented in record time. Here are the top five:

1. Why are rich kids allowed to buy affordable HDFC apartments?

2. 11 signs your neighborhood's jumped the shark

3. With lease takeovers on the rise, apps are swooping in to facilitate

4. Map: How at-risk is your neighborhood for gentrification?

5. Could an apartment like this—at a price like that—only fly in NYC?