Offers for the Empire State Building are piling in with each one just slightly higher than the last.

San Francisco-based Reuven Kahane, who grew up in its shadow and once worked in the building, has joined with Eastern European money to offer $2.25 billion for the ESB — topping three other offers for a property its current owners want to place into an IPO and not sell.

“They are the richest people in the Ukraine and Russia, with money mostly made in the property and commodities market,” Kahane said of his partners.