Since the task involved high-pressure sales in a short timeframe, a high-fidelity 360-degree Virtual Tour (cutting-edge for 2004) would have allowed them to close deals with international high-rollers who couldn't visit the 90th floor in person before signing.
If you are looking for a "useful feature" or innovative strategy based on the challenges the contestants faced in that specific episode, here is a proposal for a that would have helped them succeed: Feature: The "Ultra-Luxe Event Bundle"
One team tried to target high-end corporate clients. This feature would include a pre-packaged "Branding Kit" where a corporation could legally host a launch event and have their logos displayed on the tower's digital interfaces for that night, vastly increasing the perceived value.
The Apprentice (TV Series 2004–2017) - Episode list - IMDb
During the episode, the candidates struggled to justify a $20,000 price tag for just "one night" in a room. A useful feature for their marketing would have been an integrated within the lease agreement.
In The Apprentice Season 1, Episode 13, titled , the remaining candidates were tasked with renting out a luxury penthouse at Trump World Tower for a single night, with a minimum requirement of $20,000 .
Are you interested in other used by the winning team in this episode, or perhaps more details on the Boardroom decision that followed? Watch The Apprentice (Season 1) | Prime Video - Amazon.com