National League North City are looking for a buyer following an important meeting last night.
McGill's decision to sell follows the rejection of the Golden Share Proposal at the Supporters Trust SGM on Thursday evening.
A 'No' vote was passed by a 68 per cent majority and the Minstermen now seem to be heading for new ownership.
In a club statement, McGill said: "I was immensely disappointed at the decision last night by a majority of 139 members of the York City Supporters’ Trust to decline my offer of financing the club until the opening of the new Community Stadium - which clearly has a wide reaching impact upon the substantial loyal York City fan base.
"It is, therefore, with deep regret I consider there is no alternative other than to offer the interests of J M Packaging Limited in the football club for sale to someone who is able to reconcile the Trust’s objective of operating on a breakeven financial position, whilst providing both the finances and aspiration necessary for any sporting entity to be successful.
"Interested parties, including the York City Supporters’ Trust, in accordance with the 2006 Agreements, should contact my accountant, Steven Kilmartin at Hentons (York) Limited, 124 Acomb Road, York, YO24 4EY, with details of outline proposals and proof of their financial integrity to support a satisfactory outcome to negotiations.
"Any submissions, meeting the minimum requirements mentioned, need to be registered by April 30, 2018."