Filed Pursuant to Rule 424(b)(3)

Registration No. 333-156633

KBS STRATEGIC OPPORTUNITY REIT, INC.

SUPPLEMENT NO. 13 DATED SEPTEMBER 19, 2012

TO THE PROSPECTUS DATED APRIL 16, 2012

This document supplements, and should be read in conjunction with, the prospectus of KBS Strategic Opportunity REIT, Inc. dated April 16, 2012, as supplemented by supplement no. 1 dated April 16, 2012, supplement no. 2 dated April 16, 2012, supplement no. 3 dated April 26, 2012, supplement no. 4 dated May 14, 2012, supplement no. 5 dated May 24, 2012, supplement no. 6 dated May 30, 2012, supplement no. 7 dated July 6, 2012, supplement no. 8 dated July 24, 2012, supplement no. 9 dated July 25, 2012, supplement no. 10 dated July 31, 2012, supplement no. 11 dated August 13, 2012 and supplement no. 12 dated September 17, 2012. As used herein, the terms “we,” “our” and “us” refer to KBS Strategic Opportunity REIT, Inc. and, as required by context, KBS Strategic Opportunity Limited Partnership, which we refer to as our “Operating Partnership,” and to their subsidiaries. Capitalized terms used in this supplement have the same meanings as set forth in the prospectus. The purpose of this supplement is to disclose the probable acquisition of three office buildings containing a total of 393,502 rentable square feet in Atlanta, Georgia.

Probable Real Estate Investment

Powers Ferry Landing East

On September 12, 2012, we, through an indirect wholly owned subsidiary, entered into a purchase and sale agreement to purchase three office buildings containing a total of 393,502 rentable square feet located on approximately 23 acres of land in Atlanta, Georgia ("Powers Ferry Landing East"). The seller is not affiliated with us or our advisor.  The purchase price of Powers Ferry Landing East is approximately $17.0 million plus closing costs.  We intend to fund the purchase of Powers Ferry Landing East with proceeds from this offering, but we may later place mortgage debt on this property.  Pursuant to the purchase agreement, we would be obligated to purchase the property only after satisfaction of agreed upon closing conditions.  There can be no assurance that we will complete the acquisition.  In some circumstances, if we fail to complete the acquisition, we may forfeit up to $1.7 million of earnest money.

The three office buildings of Powers Ferry Landing East were built in 1980, 1982 and 1985, respectively, and as of September 1, 2012 were 32% leased to 20 tenants.  The current aggregate annual effective base rent, which is calculated as the annualized contractual base rental income, net of rental abatements, for the tenants of Powers Ferry Landing East is approximately $2.4 million. The current weighted-average remaining lease term for the tenants is approximately 1.6 years.  The current weighted-average annual rental rate over the remaining lease term is $19.85 per square foot.  

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