Offices at the top end of the Hong Kong market command an average of US$323 (240 pounds) per square foot (psf) per year in occupancy costs, which include rent, service charges and government taxes, according to the report released on Wednesday.

In Midtown New York, the costs are $194 psf, while London's West End is $193 psf.

A separate report published by property consultancy Cushman & Wakefield last week also ranked Hong Kong in the No. 1 spot for the world's most expensive prime office space, with an occupancy cost per desk space of $27,432, followed by London's West End at $22,665.

"For the same cost of accommodating 100 staff in a Hong Kong office, 300 can be accommodated in Toronto, 500 in Madrid and 900 in Mumbai," the report said.

Supply shortages and high demand from mainland Chinese firms help fuel Hong Kong's premium office rents, but the city also has the world's steepest rental discounts in non-core business districts, according to JLL.

"Yes, Central is the most expensive, but if you look a bit further out of the CBD in Hong Kong, it's 64 percent cheaper," said JLL Hong Kong's head of research, Denis Ma, referring to the prime Central district. "It is still very competitive."

Office rents in Central rose 5.2 percent in the first 11 months of this year, Ma said, while the rents on the opposite end of Hong Kong Island edged up 2.6 percent.

The city's commercial property and land market has seen a series of record-breaking deals so far this year.

Hong Kong's richest man Li Ka-shing's CK Asset Holdings Ltd in November announced the city's biggest real estate deal when it said it would sell its majority stake in a 73-storey office tower for a record-breaking HK$40.2 billion ($5.14 billion).

In May, another major developer Henderson Land Development shattered previous records for commercial land sales in terms of price per square foot when it agreed to pay about HK$50,000 ($6,397.71) per square foot for a rare commercial site in the heart of Central.

(Reporting by Venus Wu; Editing by Kim Coghill)

By Venus Wu