Note: Story corrected with name of company that filed the plans.
Synergy Investments today filed plans to turn the 11-story office building it owns at 294 Washington St., across from School Street downtown, into 255 apartments, under the city’s office-to-residential tax-abatement plan.
If the plans for the 1903 building are approved by the Boston Planning Department, the Post Office Square concern would be eligible for a 75% tax abatement over 29 years…