I'd put my money on it being Rick Foran of Heartland Developers (the developer chosen to develop the residential portion of the West End) and Montlack Realty. Heartland has done a fair number of higher-end residential projects in the first ring eastern suburbs (primarily Shaker) and Montlack has pretty extensive holdings as a landlord in the Shaker Square area. Not a given, but they seem to be a stronger possibility. Both have websites, which are:
http://www.heartlanddevelopers.com
http://www.montlackrealty.com
Heartland seems the more likely candidate to pursue any residential development, and have shown that they are willing to develop within the city of Cleveland or first suburbs. The Heartland website has links to current projects and a short background on their history.