Federal Election Commission filings show that the Republican nominee's campaign paid $169,758 in rent last month for space at the Manhattan skyscraper -- a dramatic jump from March, when the campaign paid Trump Tower LLC only $35,458 in rent.
The spike in rent, which was first reported by The Huffington Post
, is a result of the campaign adding two more levels to its existing space, the campaign said Tuesday.
"We calculated the rent based on the average rent per square foot in the area," the campaign said in a statement provided to CNN.
"Overall, we still pay over $40,000 less in rent than the Clinton campaign," the statement added. "Also, Mr. Trump makes a personal contribution of $2 million per month to the campaign, obviously a much higher amount than rent."
Clinton's campaign is paying about $212,000 a month, according to the Huffington Post, in rent for its 80,000 square feet of office space in Brooklyn.
Steven Cheung, Trump's director of rapid response, also told the Associated Press the "expansion is in anticipation of more staff."
Nevertheless, Hillary Clinton's campaign pounced on the reports of larger rent payments. Democratic vice presidential nominee Tim Kaine said Tuesday that Trump "has highly unusual expenditures, even in this campaign."
The 172 employees paid by the Trump campaign last month is dwarfed by the more than 700 paid staff on Clinton's campaign.
"So, as an example, Donald Trump is renting space in one of his buildings to his campaign and the campaign is paying Donald Trump personally for the space," Kaine said during a roundtable in Lakewood, Colorado. "Once he started to fundraise dramatically, he was self-funding for a while, but once he started to fundraise dramatically, he immediately tripled the rent payment that his campaign donors were paying him personally."
It isn't the first time that Trump's campaign has appeared to be working in concert with his business interests. Federal records have shown that Trump had directed almost a fifth of his campaign cash to companies to which he is linked.