The companies will pay $221 million for the building, while the total cost of the deal is valued at $258 million.
Clal will own 49% of the property.
The deal will be financed through a five-year loan of $165 million from Wells Fargo.
Clal's share of the buyers' $93 million investment in the purchase is about $46 million.
Harbor Group acquires properties for profitable commercial real estate investing, mostly in the United States.