You can donate via PEF Israel Endowment Funds Inc:
Tax deductible contributions can be made via the PEF using Beit Theresienstadt code number 2210, requesting that these funds should be directed to Beit Theresienstadt.
For your convenience the address is:
PEF Israel Endowment Funds, Inc.
317 Madison Avenue, Suite # 607
New York, NY 10017
USA
Tel: ++1-212-599-1260
Fax: ++1-212-599-5981
E-mail: pefisrael@aol.com