LOS ANGELES (CBSLA) — As the City of Angels entered into the fifth day of a teachers strike, there was hope that the mayor could bring the teachers union and the Los Angeles Unified School District together to make an agreement.

Bargaining teams from United Teachers Los Angeles and the district returned to the bargaining table at the Los Angeles mayor’s office Friday after negotiating past midnight.

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The lengthy discussions and change in tone from the teacher’s union are a hopeful signal that a bargain could soon be reached.

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The teacher’s union – which represents more than 30,000 teachers — is wrapping its first full week of being on strike, the first the district has seen since 1989. Besides pay raises, teachers say they want the district to make a bigger investment in reducing class sizes by hiring more teachers, staffing schools with more support personnel like nurses and counselors, and a cap on resources that go to the growing number of charter schools.

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The district, which serves 694,000 students at more than 1,000 schools, says the strike has so far cost $97 million due to the steep drop in attendance.