The earliest founder of the Dhaka Nawab Estate is Khwaja Hafizullah, who upheld the family tradition and made his fortune in trade and commerce.

Before his death (1854), Alimullah made a waqf (vestment) for the united status of the zamindari, turning all his property into an indivisible family concern.

The property was to be managed jointly by a mutwali (administrator), a responsibility that descended on his second son Khwaja Abdul Ghani Mia.

Alimullah served on the Dhaka Municipal Committee, taking part in the corporate activities of the city, including playing an important role in the preservation of Lalbagh Fort.

He bought many unique jewellery of the house of the Naib Nazim Ghaziuddin Haider when he became heavily indebted due to the English government stopping his allowance on charges of immoral activities.

In 1830, Alimullah purchased the French Trading House at Kumartuli on the bank of the Buriganga as part of his land acquisitions in and around Dhaka.

Alimullah proclaimed the forest land of Sadullapur as a wildlife sanctuary, and started the hunting park (completed by Khwaja Abdul Ghani).

The hunting park featured species of indigenous and exotic deer, peacocks, wild-cocks, francoline partridges and hares.

It is set in the centre of a gold armlet, with ten 5-carat (1 g) oval shaped smaller diamonds around it, used by the Nawabs of Dhaka, who also used as it an ornament on the turban.

In 1840, Alimullah bought the two garden-houses set up by Aratun, the Armenian businessman, and Griffith Cook, the British Justice, in the Sujatpur area.

He also bought much of vast meadow, known as Ramna, between the garden houses and the Sujatpur Palace flanked by Nurkhan Bazaar (set up by Nuruddin Hossain).