Mayor Michael Bloomberg wraps up his second term this week, a sophomore effort that will be known for fewer splashy successes and more failures than his first four years as a politically untested businessman.

After the billionaire former CEO first entered office in 2002, he banned smoking in bars and restaurants, won control of the troubled city school system and reversed the post-9/11 fiscal slump. He was re-elected in 2005 by a landslide, even while running as a Republican in this Democratic town.

But Bloomberg's next four years were not as easy, and some New Yorkers became resentful of his missteps and priorities, including his presidential aspirations that smoldered for more than half his term before burning out in 2008.

On Friday, the 67-year-old mayor will be sworn in for another four years, and he will face a new class of Democratic leaders in citywide posts, which could make his next term even more difficult.

"The goodwill has, in many ways, evaporated," said Kenneth Sherrill, a political science professor at Hunter College. "If you make decisions, you make enemies, and after eight years of making decisions, there are a lot of disgruntled stakeholders."

To be fair, Bloomberg had plenty of second-term achievements.

He rezoned dozens of neighborhoods covering thousands of city blocks _ a reinvention of the city not seen since the 1960s. He outlawed trans-fats in restaurant food and forced chain restaurants to post calorie counts on menus.

In schools, crime is down, the graduation rate slightly improved and students made some gains on state tests. Bloomberg also persuaded the state Legislature to give him control of the 1.1-million student school system rather than hand it back to a Board of Education model.

The decline in city crime that began in the 1990s continued, despite predictions of a recession-related surge. This year, the city is on track to have its fewest murders since comparable record-keeping began in the 1960s.

Bloomberg also managed to retain control of the office by first orchestrating a change to the two-term limit so that he could run again.

But the mayor has had many second-term setbacks.

The founder of financial information company Bloomberg LP garnered a whopping re-election victory. But shortly after his inauguration, the death of a 7-year-old girl brought close scrutiny of him and the child services agency.

Nixzmary Brown was tortured and beaten to death by her stepfather. Officials said she might not have died if the child welfare caseworkers involved in her case had acted more quickly in investigating suspected abuse when concerns were raised months earlier.