Digital impression of how the new development will look
Up to 450 new jobs could be created at an office and warehouse distribution centre at Holyhead on Anglesey.
Developer Conygar is also behind a scheme, with ferry company Stena Line, to develop the town's waterfront area.
A spokesman for Anglesey council confirmed the planning application had been received, adding that attracting jobs to Holyhead was a priority.
The second Conygar scheme would be for a residential, leisure, tourist and retail development on the waterfront.
The company says the office and distribution centre on 120 acres at Parc Cybi, in Holyhead, could help counter the effect of job losses when the Wylfa nuclear power station closes, and also as the result of the end of smelting at Anglesey Aluminium, nearby.
It would feature three two storey office buildings at the entrance and four industrial warehousing/distribution units totalling 110,000 sq ft bordering the A55.
Robert Ware, chief executive of Conygar said the development could cater, depending on the user mix, for up to 450 jobs.
He said the company had "identified a requirement for a warehousing space for transport users who use Holyhead".
"The proposed development will, we believe, strengthen the attraction of Holyhead to the logistic industry and it is our intention, if consent is granted, to investigate amongst other uses the provision of refrigerated storage and bonded warehousing," he added.
A spokesman for Anglesey council said the planning application had been received and would be considered by councillors in the spring of 2010.
Sasha Wynn Davies, the head of economic development said: "The recent job losses at Anglesey Aluminium and Eaton Electric make it vital that we attract new jobs to the Holyhead area.
"I am very pleased to see a proposal by the private sector for an investment on this scale, and this should give us confidence for the future," she added.
Wyn Parry, port manager at Stena Line, which manages the port, said it was good news for Holyhead.
The Parc Cybi business park is just off the A55 south of Holyhead
"This will help attract more freight to the port and having these facilities will mean more jobs created locally," he said.
"There is real potential and we know from our discussions with Conygar that companies are already expressing an interest. "
He added it could also be a catalyst for Parc Cybi and lead to further developments.
In a statement the company said the Welsh Assembly Government saw the applications as an "indication of growing confidence in the area".
Interest in the site is also shown with Brian McCarthy, chief executive of Doyle Shipping Group in Ireland quoted as saying the development would "fill a void that has existed at Holyhead port".
"We are very interested in securing a role in the development and bringing our expertise and experience to the project," he added.