Mark Gunther First National Real Estate Healesville, Yarra Glen, Yea & Surrounds At Mark Gunther First National Real Estate, we always aim to provide the best possible service and a consistent range of high quality Residential, Rural and Lifestyle Properties, Marketing, Sales & Rentals to our clients at all times. The Healesville & surrounding Yarra Valley Region has gone from strength to strength in the past 5 years. The area's growth has created many new diverse boutique business opportunities to cater for all the different Lifestyle trends emerging in this Region.