The owners of the historic Marshall Tavern are seeking investment partners to help renovate the building, which has stood empty since 1990, and create five vacation rentals and a public deck. In the past month, Daniel Altman and Avi Atid, Berkeley residents, have used Craigslist to put out a call for people to invest $300,000 to $400,000. The owners have all the necessary permits from the county and the California Coastal Commission to begin construction…