1887	Seventeen acres purchased at One Tree Hill for the erection of a Home for the Aged Poor - this to be funded by the Costley Bequest.
1889	Plans for the Home were approved, and on 25th April the Foundation Stone was laid by the Governor, the Earl of Onslow.
1890	On 24th April, the Costley Home for the Aged Poor was opened by the Governor, the Earl of Onslow. There were six wards with accommodation for 178 males and 58 females. The 148 people were admitted when the Home was opened

1904	The Chapel had to be used as a ward because of gross congestion. The Kitchen, laundary and boiler-house were built.
1906	A Male Infirmary was built - 33 beds for chronically ill patients.
1910	Complaints re management, led to Dr McKelvey being appointed to complete control of the institution. He was Medical Superintendent until his death in 1931. The hospital now held 220 patients. TB patients were admitted and consumptive shelters built for them.
1912	The original nurses' home was erected. This later became the administration building and was finally demolished in 1964.
1915	A second storey was added to the Male Infirmary.
1918	There were 248 patients and the staff comprised of one resident medical officer, one registered nurse, 8 nurse-attendants, 3 cooks, one housemaid, 6 laundresses, 13 porters, 3 gardners and 3 engineers.
1919	There were now 12 TB annexes with two dining rooms.
1923	The Women’s Infirmary was built. The wards were named "Rowe" after Mr John Rowe, Chairman of the Costley Home Committee and "McKelvey" after the Medical Superintendent.
1924	The name was changed to the Auckland Infirmary.
1925	The first wing of the existing brick nurses home was built.
1926	The staff now consisted of 9 sisters, 44 nurses, 20 orderlies, the Medical Superintendent Dr McKelvey and a resident medical officer Dr C.McDowell.
1929	The laundry buildings were renovated. There were now 420 patients.
1942	The Auckland Infirmary became a general hospital and was named Green Lane Hospital.
1943	The six-storey main block was opened. Ward 1 on the ground floor accommodated children, ward 2 was for thoracic surgery, ward 3 medicine (including cardiology), wards 4 and 5 were general surgery and the top floor was the resident medical officers’ quarters. Operating theatres were improvised on the ground floor of the Costley Block.
1944	The Casualty Department was opened in the ground floor of the Costley Block. The first hear operation was performed.
1946	The brick nurses’ home was enlarged to about six times its original size.
1950	The operating theatres moved to the ground floor of the main block, displacing the children’s ward.
1953	A number of the better TB shelters were amalgamated to form the Chest Annex.
1958	First trainees entered the Green Lane School of Nursing. First heart bypass operation.
1959	A new large boiler house was built on the site of the old laundry to supply not only Green Lane but the soon to be built National Women’s Hospital.
1960	Cardiology patients shifted from Ward 3 to the chest annex. The hospital now had 451 beds.
1962	The only part of the hospital now catering for geriatrics was the upper floor of the Costley Building. (Many elderly patients had been transferred to Cornwall Park Hospital in the years following World War II). The chest clinic, medical records and autoclave room, as well as the casualty department, were on the ground floor. The remainder of the original home was occupied by the x-ray department.
1965	National Women’s Hospital opened on the Green Lane site, where the upper part of the vegetable gardens had been. It was complemented by a large, new nurses’ home. The Green Lane Administration Block opened. the Accident & Emergency Department and clinics were accommodated on the ground floor. In the sixties, the swimming pool and hospital hall were also opened.
1970	Stage 2 building opened.  The old brick dormitories behind the Costley Block were removed to make room for the Stage 3 building.
1975	New hospital chapel opened in Stage 2 building, 7th floor.
1976	Stage 3 building deferred.
1983	The hospital had 574 beds.
1984	North Shore Hospital opened with a major transfer of Green Lane general surgery and medicine to this new institution.
1987	December – first heart transplant.

1989	Shift of remaining general medicine and most of general surgery from Green Lane. All geriatrics and gastroenterology removed. Emergency Department closed. Shift of Auckland Hospital’s ENT department to Green Lane.
1990	Shift of gynaecology from National Women’s to Green Lane. Hole excavated for Stage 3 eventually put to use – as a carpark.
2003	Major Greenlane Hospital services transfered to the new Auckland City Hosptial

The History of Green Lane from 'Green Lane Hospital, The First Hundred Years', edited by B.R. Hutchinson, Published by the Green Lane Hospital Centennial Committee 1990 and Printed by Albion Press Ltd, New Lynn, Auckland.