A newly-formed group will help lodge an appeal over the Gorge Hotel's approval.
The $50 million, 39.5 metre Launceston hotel would be built on the corner of Margaret and Paterson streets.
The City of Launceston council approved the development application nine votes to one last month.
On Tuesday, Launceston Heritage Not Highrise confirmed an appeal had been lodged against the development with the Resource Management Planning Appeal Tribunal.
Spokesman Jim Collier said the group firmly believes it can get the approval overturned, but would be willing to go into mitigation with the proposal's developers JAC Group.
"We're not trying to stop hotel development in Launceston. It must be the appropriate hotel and in the right location. Launceston is not Melbourne, Sydney, New York, Singapore or even London. Launceston is unique," he said.
"We formed because we're very concerned about the proliferation of high rise buildings in Launceston and have formed as a lobby group."
The group held its inaugural meeting two weeks ago, and had standing room only, with 50 members signed up, Mr Collier said.
The appeal will be based on jurisdictional ground, land stability, flooding, bird strikes, noise, building height, over shadowing, and existing road access.
The group also believes the City of Launceston council acted outside the requirements of the Launceston Planning Scheme.
"We have legal advice from one source that says we are right in our direction, that Launceston City Council has acted outside of its guidelines. I have another one here from a regional planner who has a similar opinion," Mr Collier said.
The appeal will be lodged on behalf of Susie Cai and her family, who run and live above the Golden Brumby Chinese restaurant. The building will be overshadowed by the proposed nine-storey hotel.
Ms Cai was not planning to lodge an appeal, but has changed her mind.
"I didn't want to sit back and get trod on. I believe this isn't just about the building, but the moral as well," she said.
"They know they are leaving me without sunlight and I feel that there is no consideration for me when they put in the application at all."
The JAC Group, and City of Launceston council were contacted for comment.
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