Chicago's development party started to wind down at the end of the last decade. The new one may bring the hangover.

After a building boom that has stretched the boundaries of downtown and put a record number of cranes in the air, new construction projects are forecast to fall 10 percent this year, according to New York-based research firm Dodge Data & Analytics. If that prediction is right, it would mark the third annual decrease in four years and the biggest single-year drop in construction starts since the Great Recession.

It's hard to see such a slowdown coming when looking around the city today: Demand for office space just capped off its best year since 2007, apartment rents are pushing record highs and developers can't seem to build enough industrial space to satisfy retailers' voracious storage space appetite as more people shop online.

But deep into the nation's longest period of economic expansion—and with lessons of the last market crash still top of mind—developers and real estate investors are signaling they're not sure how much more room there is to grow.

"I spend every day talking with capital partners and trying to sell them on (new projects in) Chicago, and this has been the most challenging time that I can remember," says Michael Newman, president of Chicago developer Golub, whose firm is redeveloping Tribune Tower and has been among the most active in Chicago real estate over the past decade.

Golub is stepping up its work in other markets, including Denver and around the Southeastern United States, but has no new Chicago projects slated to break ground this year or the first half of next year. It's not that they're afraid to, Newman says. Big financial partners are more reticent to back projects as headwinds pick up for landlords.

"The markets aren't shut off fully, but there are many investors we work with saying, 'Let's wait a little bit to see how some of this shakes out,' " he says.

There are macroeconomic challenges holding up new projects—a presidential election year, global economic unease and the threat of new tariffs and trade wars, to name a few. Then there are the even tougher local obstacles: Real estate investors are flummoxed by an overhaul of how Cook County values properties and what that means for property taxes, and tighter affordable housing policies stand to hamper the boom in new apartment developments. Dodge predicts a 24 percent reduction in starts of new multifamily buildings, which drag down the forecast along with a projected 39 percent decrease in new health care construction and a 14 percent drop in new warehouse development.

A substantial slowdown in new projects on top of plummeting commercial property sales last year would indicate that real estate investors think the best days of the current economic cycle in Chicago have passed.

"I think developers and investors have developed a very dim view on Chicago and will maintain that perspective for the foreseeable future," says John Murphy, whose firm is transforming the former Cook County Hospital into a dual-brand Hyatt hotel and medical offices. "It's really unfortunate, because the fundamentals for growth are there."

Dodge forecasts that new construction will still be relatively strong in Chicago, despite the expected decline outpacing the projected national 4 percent drop-off.