Hey Emily!!! There are several organizations that can help you out - especially if it is a temporary situation where the owner wants to take the cat back. One is below - Hope Vet is my vet and they're great. If they can't help you out, they'll know of other organizations that will.
Other organizations in general that you can check are Alley Cats - although I supposed they mostly deal with feral cats : https://www.alleycat.org
Another great placement organization is Anjellicle Cats: www.anjelliclecats.com
And check this out:
http://brooklynanimalfosternetwork.org/index.html
This is an interesting list of rescue organizations in NYC:
http://www.catswithnoname.net/NewYork.htm
http://geocities.com/fostercats/
Anyway -- I think that you can find a way to find a foster by talking to some of these organizations. Please don't put him/her in a shelter! Or put her down. I have a very small separate room but it's not ideal - and I have three cats!! But please let me know if you don't find a solution and I'll see if I can help.
Karen Holt
From: Infinite Hope <Infinite_Hope@mail.vresp.com>Subject: A Message From Hope VetTo: karenholt@verizon.netDate: Monday, August 18, 2008, 4:11 PM
Dear Karen,
At Hope Vet, we know that our clients love their pets—and we know the feeling is mutual. It is hard for any of us to imagine not having our companions by our side.
Yet every day we hear of heart-wrenching stories of pet owners facing personal crises who have no other option but to surrender their animals due to situations beyond their control. Traumatic events such as domestic violence, foreclosure, fire, eviction, and illness can instantly force the separation of people and their beloved pets.
In the case of battered women, the statistics are alarming—just last month we learned that as many as 48% of these women delay leaving abusive situations out of fear for the safety of their animals.* A fear well justified when you consider that 71% of abused women reported that their batterers had harmed, threatened or even killed their pets, often in front of them and their children, as a way to coerce, control or humiliate them.**
While shelters provide a safe haven for victims of abuse and those who have been evicted, their animals are rarely welcome. Sadly, these individuals and families face the additional pain of giving up their pets in order to access help and safety. And for pet owners who are ill and need emergency medical care—where do they turn to for pet assistance during hospitalizations?
There is now hope. Infinite Hope.
We are very pleased to announce a new direction for Infinite Hope, a non-profit organization affiliated with Hope Vet. Our first initiative in conjunction with the Mayor’s Alliance for NYC’s Animals will assist people in short-term crises so that they can continue their relationships with their pets. While other cities have established safe pet programs, Infinite Hope is the first of its kind in New York City.
We could use your help. There are many jobs to do as we begin—develop a website, create a newsletter and establish a trusted foster care network.
If you can assist us in getting the program started or if you would consider opening your heart and home to someone’s pet who needs fostering for a short time, we’d be infinitely grateful. Simply hit reply to this email and we will send you additional information.
Together, we can show people and their pets that where there is help, there is Hope.
Sincerely,The Infinite Hope Team
* Ascione, F.R. (2007) Emerging research on animal abuse as a risk factor for intimate partner violence. In K. Kendall-Tackett & S. Giacomoni (Eds.) Intimate Partner Violence (pp.3-1 to 3-17). Kingston, NJ: Civic Research Institute.
** Ascione, F.R., Weber, C.V., & Wood, D.S. (1997). The abuse of animals and domestic violence: A national survey of shelters for women who batter. Society and Animals, 5(3), 205-218.

Karen Holt