It would be impossible to give a market value on most properties, especially mixed use, without seeing it first and obtaining income/expense info. I can tell you that there is a simular building on the market in Gloucester on Main Street with water views currently listed at $739,000. Of course, what it is listed for has almost nothing to do with its market value - it could sell for $100,000 or more less than its list price. There is also another simular building, without parking, listed for $425,000.
Contact a commercial Realtor for full market analysis of the property.