The bill, Substitute Senate Bill No. 575, aims to expand the existing bioscience enterprise corridor zone in Plainville by including all of a specified census block, rather than limiting it to just 53 acres zoned for a technology park. The new legal language replaces the previous designation of "fifty-three acres of property zoned Technology Park" with a broader inclusion of "census tract 420700, block 2000, as designated in the 2020 federal decennial census." This expansion allows more eligible businesses and commercial properties to qualify for enterprise zone benefits, which are available to businesses engaged in bioscience, biotechnology, pharmaceuticals, or photonics research, development, or production.

The bill also outlines the eligibility criteria for businesses and commercial properties to receive these benefits, including a requirement that businesses have fewer than 300 employees and have been operational for at least 12 months. The enterprise zone benefits include significant property tax exemptions and fixed assessments for qualifying improvements. The bill is expected to have a fiscal impact on Plainville, potentially resulting in a grand list reduction due to additional property tax exemptions, although this may be offset by state reimbursement through the Distressed Municipalities grant program. The act is set to take effect upon passage.