New York City's Democratic primary was held Tuesday, and all eyes are on the mayoral race. But that's not the only race voters are deciding on.

All 51 seats on the City Council will be up for grabs in November, and in nearly every district, there are multiple candidates competing in Democratic primaries. Eight races are for open seats, and the themes of many of these contests mirror the battles playing out at the mayoral level, with affordability a key issue.