Back in July, when we last reported on Silver Tower, the development was 75 percent sold, so it was a bit surprising to find the project promising $5,000 in upgrades on all homes purchased between Sept. 1 and Nov. 30. That last 25 percent can take longer than the first 75, so At Properties is kicking the giveaways up a notch at the River North development, located at 303 W Ohio St. The 225-unit building contains one-, two- and three-bedroom luxury condos starting at $290,000. Every unit has floor-to-ceiling windows and a balcony or a terrace. After they’ve picked out their upgrades, residents can work out 24 / 7 in the “state-of-the-art” fitness center or hang out with their pups on one of those high-rise dog runs that we keep coming across.