In return for additional tax breaks from Nassau County, a landlord promised that tenants of his buildings in the county would provide new jobs for at least 1,512 people, officials said.

Milvado Property Group received final approval from the county’s Industrial Development Authority last month for an additional 11 years of property tax savings in addition to the 15 years first granted for 12 of the 14 buildings in 2013. The other two received 15-year contracts beginning next year.

The Syosset-based landlord was also granted an exemption from mortgage recording taxes of up to $2.6 million.

Nevertheless, the new incentive package is far smaller than the one proposed by Milvado in March.

Milvado had asked for additional property tax savings over 30 years – a total of 45 years – as well as an exemption from sales tax of up to $8.4 million and property tax of up to $2.6 million. The company had only promised to protect the jobs of its 12 employees.

At the time, the proposal was met with skepticism. IDA board member Reginald Spinello, a former mayor of Glen Cove, questioned whether another 30 years of property tax relief would be necessary to rehabilitate the aging buildings.

At the IDA meeting last month, Spinello supported the smaller incentive package and praised Milvado for agreeing to guarantee the jobs of hundreds of people who work for building tenants.

John Ryan, Milvado’s real estate attorney, said they are “putting our efforts into this guarantee to ensure that these … jobs stay in Nassau County, even at the risk of losing the (tax-saving) benefits.”

He said the company needs more help because its buildings were constructed a long time ago and now require upgrades, including at least $25 million in improvements to comply with New York State’s new environmental regulations.

More than 80% of the buildings’ leases are expiring in the next five years and not all of them will be renewed, in part because working from home is becoming increasingly popular. Ryan said there is “significant vacancy” at the buildings at 6801 and 6901 Jericho Tpke., both in Syosset.

The two are located along with three other properties in Milvado in the Syosset Central School District, which have been eligible for property tax savings since 2013, according to Superintendent Thomas L. Rogers.

He said the additional tax breaks would “negatively impact the school district” because they “potentially limit the district’s current and future local revenue sources…. Any further increase in these (payments in lieu of taxes) will further shift the tax burden onto the rest of the school district’s taxpayers,” Rogers wrote in a July 29 letter obtained by Newsday through the state’s Freedom of Information Act.

State records show Milvado has saved more than $16 million in property taxes and $270,000 in sales taxes since 2013.

The new incentive package provides for an annual increase in property taxes of 2%.

The IDA acknowledged the school district’s concerns but voted unanimously in favor of the additional tax relief.

“Part of our mission is to keep jobs in these buildings, to keep them in Nassau County,” said William Rockensies, IDA chairman and engineer. Milvado “is willing to guarantee us 1,500 jobs and make a major investment to reduce the carbon footprint of the buildings. That’s the kind of project we want to do,” he said in an interview.

Elsewhere in the state, several Investigational Development Agency (IDA) companies have also offered tax breaks to landlords in exchange for promises that the buildings’ tenants would maintain employment, says Ryan M. Silva, executive director of the New York State Economic Development Council, which represents the IDAs in Albany.

James T. Madore writes about Long Island business news, including economics, development and government-business relations. He was previously the Albany bureau chief.