Eisner and his Tornante investment group are in exclusive negotiations to pay £5.67m for 100% of the club.
The Pompey Supporters Trust (PST), which controls 48% of the club's current ownership structure, has set out the deal in a 48-page document.
Portsmouth recently secured automatic promotion from League Two.
California-based Eisner, 75, will present his offer in person at a town hall-style meeting on Thursday, and also aims to invest an additional £10m in equity should the deal go through.
The current ownership structure helped bring Portsmouth out of administration in 2013.
Eisner's 70-day exclusivity period runs until 1 June and existing club shareholders will have the final say on accepting any offer.
The PST are set to recommend to its shareholder members an "all cash now" acquisition option, giving them a full return on their original £1,000 investment per share.
Under Eisner's proposals, there would no longer be room for three PST members on the club's nine-strong board.
They would sit instead on a newly-created heritage board to protect matters such as the club's name, colours, badge and moving its home ground more than 15 miles from Portsmouth city centre.
"The PST board believes that the best long-term future for the club is for the PST to retain some ownership," a statement said.
"Tornante have agreed a heritage share can be issued, which will be put in place as a means by which certain identified issues can be protected and vetoes exercised by the PST.
"The decision is for each community shareholder based on their assessment of the offer."
Eisner, who is previously understood to have shown an interest in buying Championship club Reading, is also a former president of Paramount Pictures as well as an early investor in Netflix.

Wales host the  showpiece event on Saturday, 3 June, at the Principality Stadium in Cardiff.
Speaking to BBC Wales, chief executive Jonathan Ford said he "would love the FAW to be considered in the future to host these major events".
He also said Wales' run to the semi-finals of Euro 2016 has boosted their standing in the game.
Hundreds of millions of people around the world are expected to tune in to watch the Champions League final live.
Ford said the FAW had built up its credentials in hosting major tournaments and matches, and he wanted more.
"We do not want it to just stop there in June," he explained. "We would like to continue to do it."
Wales has already hosted the Uefa under-19s Women's championship in 2013 and the Super Cup final in 2014, but the Champions League final is a giant step up, with estimates it will generate £45m for the local economy.
"We are at the business end now," Mr Ford said.
"We have got a team of 12 people at the FAW working full time on it, and in Wales alone there are probably several hundred people working on it.
"That will go up when Uefa are over here and if you add in the volunteers and the people working in the stadium then you are probably talking about four to five thousand people who will work this event.
"There is a lot of work being done to make sure this is successful and to make sure we utilise it to achieve the objectives we have with football."
Hundreds of thousands of spectators - with and without tickets -  are expected to travel to south Wales in the days leading up to the final, with the FAW, police, governments and local authorities involved in a huge logistics exercise.
Details of road closures and restrictions in the Welsh capital are yet to be officially published, but significant disruption is expected.
Major sporting events in the Welsh capital have been dogged by transport problems in the past, down in part to capacity issues at Cardiff Central railway station and pinch-points on the M4 at the Second Severn Crossing and Brynglas Tunnels in Newport.
BBC Wales has been told that 10% of the UK's entire rolling stock of coaches will be used to bring fans in and out of Cardiff on the day of the final and 21 intercity trains will be in place after the match to take supporters from Cardiff back to London.
Wales take on Ireland in a World Cup qualifier on Friday, still unbeaten in their group, but needing a win to improve their chances of qualifying for the finals in Russia next year.
Supporters and shareholders of Portsmouth have been presented with the terms of a takeover offer from ex-Walt Disney chief executive Michael Eisner.
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The Football Association of Wales is considering a future bid to host another Champions League final.