In 1870 Messrs Walker and Douglas acquired title of all their land known as Moana-tua-tua Estate and it soon became apparent that their drainage program was going to pay off.
During the 1870's as a result of several incidents of hostility shown by the Maoris towards the intrusion of the 'Pakehas' onto their tribal lands, Mr Walker decided to protect the homestead by digging a deep trench and erecting a high wall round the homestead with loopholes for rifles. An underground tunnel was also constructed to connect with the out-buildings.
The management of "Mona Vale" was handed to Thornton Walker (E.B. Walker's eldest son) and his co-owner John Benn in 1880, and in 1896 the estate was subdivided and sold.
Original Burnt

About this itime Charles Channing Buckland obtained 800 acres of Monavale Estate including the original homestead, which he had burnt down. He then built the present kauri home.
His father, William Francis (Frank) Buckland - a former mayor of Cambridge - moved to Monavale after his wife's death. Channing had a greenhouse built where his father raised prize chrysanthemums and where he perfected the King Alfred Daffodil.
Channing sold the 800 acres about 1919-20 after the flu epidemic had taken a toll on his health. His doctor advised him to make a complete change so he sold up and moved to Canada.