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Unfortunately, income from warehousing is subject to self employment taxes. You can verify this using this link: http://www.irs.gov/instructions/i1040sse/ar02.html
Rental income from a farm if, as landlord, you materially participated in the production or management of the production of farm products on this land. This income is farm earnings. To determine whether you materially participated in farm management or production, do not consider the activities of any agent who acted for you. The material participation tests for landlords are explained in chapter 12 of Pub. 225.
Cash or a payment-in-kind from the Department of Agriculture for participating in a land diversion program.
Payments for the use of rooms or other space when you also provided substantial services for the convenience of your tenants. Examples are hotel rooms, boarding houses, tourist camps or homes, trailer parks, parking lots, warehouses, and storage garages.
The above is from the IRS publication that I linked to. It specifically states that payments for the use of a warehouse are subject to self employment taxes.
I'm truly sorry if you expected otherwise.
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