- Gregg & Kaufmann Real Estate Pty Ltd - MOSMAN 1/175-179 Avenue Road MOSMAN 2088 Tel: 02 9969 8600 Fax: 02 9969 9744 Email: gabor@greggkaufmann.com.au PROPERTIES WANTED Gregg & Kaufmann Real Estate, established in 1990 is a family run business in the true tradition of personalised attention and service. Gabor & Zsuzsanna Kaufmann together with their son Marton lead an efficient & knowledgeable ...www.greggkaufmann.com.au