The "L" train shutdown does not start until next spring, but construction in Brooklyn has already started.
The MTA needs to repair the Canarsie Tunnel after flooding from Hurricane Sandy.
With crosswalks and sidewalks closed, and construction equipment lining the streets, there's concern about the impact on real estate in Williamsburg.
Brokers say rent prices have not dropped yet, but many deals are expected soon.
"Landlords will concede some more than others. If you're in the luxury rental market, absolutely. you're going to get everything handed to you. Months and months of concessions. No fees," said Wlater Steffen of Nest Seekers.
As far as sales, brokers do not expect much to change since buyers are making a long-term investment.