The phrase "a time when development" is correct and usable in written English.
It can be used to refer to a specific period or moment in which development occurs or is significant.
Example: "The 1990s was a time when development in technology accelerated rapidly, changing the way we communicate."
Alternatives: "an era of development" or "a period of growth".
This at a time when development pressure is unprecedented and available open space dwindling.
Officials and environmental groups that lobbied against the Suffolk proposal said it would have sharply curtailed borrowing against future sales-tax revenues for land and farm purchases at a time when development pressure warranted maximum spending.
Gary W. Parr, the orchestra's chairman, gave a charming historical description of the first Philharmonic concert in 1842 at the Apollo Rooms on Broadway off Canal Street, at a time when development in Manhattan extended "way up to 14th Street".
The environmental groups, led by the Nature Conservancy, said the approach was misguided and would mean that money for acquisitions, projected by the county at about $176 million by the time the tax expires in 2013, would be reduced to a yearly trickle at a time when development pressure required maximum preservation efforts.
It is useful to be reminded of the power and grandeur of this symbol of New York at a time when development on the West Side is being planned that will forever obstruct some of the most famous views in the world.
There were signs of anxiety in the poll, perhaps because it was conducted at a time when developments have made people feel more vulnerable.
Both were in a group that came to be known as the "fragile five" in 2013 at a time when developments in US financial markets made emerging economies with large current account deficits look susceptible to destabilising capital flight.
We fear that this historical, field-oriented division impedes the progress of research at a time when the development of new pesticides and drugs is a growing problem.
The project, "Brain Research Through Advanced Innovative Neurotechnologies," or its diminutive, "Brain," comes at a time when nanotechnology development is mature enough to devote considerable resources and a "dream team," to important developments in neuroscience that will hopefully have profound effects on Alzheimer's, PTSD, traumatic brain injuries, and mental health care.
The research comes at a time when coastal development in the U.S. is booming.
Scotland invested £675m in affordable housing in 2009-10, approving 8,663 new homes at a time when the development rate elsewhere began to tank.
