This week readers visited Brick Underground to learn about an increase in sponsored co-ops on the market. Brick found listings for these types of apartments, which don't need board approval, are up by about 50 percent, likely because of Covid-related deaths.

Also if interest: Some NYC pied-à-terre owners are eager to sell because the city's amenities are mostly shut down and they're not coming here—which means buyers can benefit from rarely available apartments with high-end renovations.

Here, in full, are this week's most popular posts.

1) An increase in NYC sponsor co-ops for sale is likely a result of Covid deaths

2) Shutdowns spur some NYC luxury pieds-à-terre owners to sell

3) How will renting in NYC change if mom-and-pop landlords cash out?

4) Manhattan saw a 58 percent jump in renters signing new leases in January

5) Where to find some great deals on NYC rental apartments