Planet Fitness has scrapped plans to open a gym downtown near the Detroit riverfront.

A 30,000-square-foot gym was supposed to have opened this spring in the lower level of the building at 1400 Woodbridge St. after a $2.5 million investment. But owners never had the chance to install so much as the "lunk alarm."

Planet Fitness spokeswoman Mary Scott said plans fell through a couple months ago when the property owner tried to renegotiate terms of the lease after it was already signed.

"After the lease was signed for the riverfront location, the landlord wanted to change the terms of the agreement," Scott said in an email. "Although we were all disappointed it did not work out for this location, we are very much interested in being downtown and are continuing to look for space."

According to city records, the property is owned by 1400 Woodbridge Ventures LLC, which is registered to Clint Mansour of Mansour Properties. Najor Companies, a real estate development and investment management firm in Birmingham, is also an investor in 1400 Woodbridge Ventures LLC.

A message seeking comment was left with a spokeswoman for the ownership group Wednesday.

The deal with the gym franchise isn't the only thing that's fallen through at 1400 Woodbridge. A parking deck there collapsed in May, taking eight cars with it. It was later determined that the cause was improper construction and shoddy maintenance. It was also revealed that the city missed a regular inspection of the structure.

The four other new Planet Fitness locations in metro Detroit — in the city of Wayne, Garden City, Auburn Hills and Lake Orion — are forging ahead. Scott said there have not been any locations selected in Detroit to replace the riverfront site and that there is no definite timeframe for doing so.

"Obviously it was our plan to be there this year, so as soon as possible," she said.