The independent expenditure group backed by the Real Estate Board of New York over the weekend invested nearly $30,000 for mail in two key Long Island state Senate districts.

Filings with the state Board of Election show Jobs For New York spent $13,358 on mail in the third Senate district, where Republican Tom Croci is trying to retain a Suffolk County seat for the GOP.

The investment comes as Democrats are optimistic about taking SD-3 from the Republican column with Adrienne Esposito, whose campaign is on the air with radio and TV since last week.

Meanwhile, in Nassau County, Sen. Jack Martins is benefiting from a $15,129 mail campaign via Jobs For New York.

Previously, the group had looked toward upstate and Hudson Valley Senate races, contributing funds that would benefit Republicans George Amedore, Terrence Murphy and Susan Serino.