The 0.5% levy is payable to the authority by owners of projects above Sh5 million.
A group of rich Qataris jetted into Kenya this week to scout for deals in the country.
Mr Pattni has been investing heavily in the city's land and property sector since January.
The property is expected to appeal to high net worth international buyers.
Nairobi building permit fees are said to be the highest across the continent.
Thika Road completion has also seen malls being rolled out along the route.
Developers unveiling projects targeting people earning less than 30,000 a month.
The masterplan proposes the creation of more than a dozen commercial centres.
The Kenya VAT Act 2013 has brought about a new construction materials pricing regime.
Nairobi has enjoyed a construction boom over the past five years.
Developers will be allowed to build up to 75 floors in high-density areas.
The much-awaited summit will take place on June 12-13, 2025.
All development applications will now require residents' approval.