Union Square The Arch Sun Tower (blk 1a)

Building facts

Address

1 Austin Rd W Union Square The Arch Sun Tower (blk 1a)

District

Yau Tsim Mong

Street

Austin Road W

Occupation permit date

15 Sept 2005

Age

about 21 years

Occupation permit no.

PR48/2005(OP)

Use

Residential / composite

Block type

Tower

Nearest MTR

Kowloon (about 250 m) · Austin (about 390 m)

BD block ID

5315490

Source: BD building information and age records · Updated 19 Oct 2026

Buildings Department orders and notices

These are BD's cumulative counts, not the number still outstanding, and earlier orders are not on the lists. Before a purchase, check BD's orders search, the MBIS/MWIS notice search and a land search. See our guide to inspections and orders.

First seen on a BD list by this site: 17 Oct 2026

Inspection scheme age thresholds

• Not yet the 30-year age threshold of the Mandatory Building Inspection Scheme (domestic buildings of 3 storeys or fewer are exempt); BD may serve an inspection notice.
• Reached the 10-year age threshold of the Mandatory Window Inspection Scheme (same exemption).

Age counts from the occupation permit date; BD selects buildings for notices by risk. See BD: MBIS.

Record history

• 15 Sept 2005 · Occupation permit issued (PR48/2005(OP))

We check BD's lists monthly; new orders and compliance will show here as they appear.