Currently, there are a total of 10 rental listings in New Providence. Most are single family homes which are listed from 1500 up to $3500 (highest listing) for a 4br/3bth home.
As far as townhomes, there is only 1 listing - a 2br/2bth in Murray Hill Square - listed at 2650
There is a 2 br apt listed at 1300 (the lowest price in town) and a 3 br apt, at 1850.
I am not sure if you are asking how easy it is to find a townhome to rent there, or how easy it is to rent out a townhome you might already own.
As you can see - there are limited rentals available.
Overall - the rental market in New Prov., and other towns, is quite brisk, as many consumers can't buy in this economy, so they are turning to rentals instead.
Hope this helps!
Good luck, and please let me know if I can be of further help...........