When you think about the most expensive offices space in the world, cities like New York and London,with their reputations as global financial centers, spring to mind. However, when it comes to pricing, Lagos, the commercial capital of Africa’s largest economy has managed to find a comfortable spot among them.

Rentals for prime office space in Lagos (Ikoyi) is up to $90 per sq. ft per annum this year, above those seen in Midtown Manhattan in New York where rents are closer to $76 per sq. ft per annum, according to new data by CBRE, Broll and JLL, real estate firms. They are also trailing the $96 per sq. ft rents seen in the City of London and more than four times higher than prime office rents in Illovo, Johannesburg.

For yield-seeking real estate investors, the Lagos opportunity might appear attractive at first glance. But the factors behind the numbers are worth digging into.

Gross inadequacy of real estate supply has acted as a major driver to high rents in the past decade. Less than 650,000 sq. ft. (60,000 sq. meters) of prime office space in fewer than 10 high-rise office buildings in Victoria Island and Ikoyi existed in Lagos prior to 2010. Other office towers did exist in the old Central Business District, but their glory days laid in the late ‘80s and ‘90s. As age and congestion began to set in and landlords refused to refurbish, corporates relocated to residential office conversions in Victoria Island. Consequently, demand began to outstrip supply, allowing the few owners of prime office space get away with seemingly ridiculous rentals. Even though there is currently up to 1.9m sq. ft. (180,000 sq. meters) of office space to be completed over 24 months, investors are still checking to see if there’s room for more.

The historically low supply and opportunity to demonstrate what real prime grade quality office space is like has created interest from global and domestic institutional real estate investors in recent years. Actis, an emerging market private equity firm, launched the first sub-Saharan Africa private real estate fund at $154 million and have a handful of real estate interests in Lagos and Abuja. The most relevant is a 15,600 sq. meters office development that is slated for completion before year-end. The $165 million CAPIC fund by African Capital Alliance also followed and they have successfully completed a prime office development in 2012 with Mansard Insurance (now part of the AXA Group). Even the world’s richest black woman, Modupe Alakija, executive chair of the Day Spring Property Development Company is getting in on the real estate business in Lagos. The company recently completed a 12-floor mixed use development, with 3 floors of office space included probably to cash in on the lucrative market.