This reclamation in the 1920s pushed the Wanchai coastline from Praya East (today's Johnston Road) out to Gloucester Road.
We can follow its progress in the annual reports of the Public Works Department.
Work began in 1921, though the major work didn't get going until the following year. Here's the description in the report for 1921:
Praya East Reclamation Scheme
130. Contribution by Government towards Fund for Reclamation - As mentioned in paragraph 171 of last year's Report, those persons entitled to participate in the Scheme accepted it under the conditions laid down by Government at a meeting held on the 4th May, 1920. An Ordinance (No.17 of 1921) authorizing the Government to carry out the works was introduced on the 9th September, 1921, and a contract was awarded to Messrs. Sang Lee & Co., [...]
The Contract Documents were signed on the 20th October and notice was given on the 1st November to commence the works, the Contract time for completion being 6 years. From then to the close of the year operations were confined to the erection of offices for the Assistant ENgineers and Overseers, workshops and coolie quarters, construction of the transport track along Bowrington Canal and the construction of Guide-pile Stagings on the line of the Sea Wall.
The completion is noted in the report for 1929:
166. Praya East Reclamation:
(a) Filling. - The filling in of the reclamation was completed on the 31st May. The quantity of filling material deposited in the reclamation during the year amounted to 17,939 cube yards, making a total of 3,111,099 cube yards, of this total 2,906,120 cube yards was paid as filling from Morrison Hill, the balance (204,979 cube yards) was from other sources, the greater portion coming from East Point Hill. The total area of land formed was 90 acres, of which, about 3 acres was formed during the year.