Item 1.01 Entry into a Material Definitive Agreement.
On November 5, 2008, Orbital Sciences Corporation (the "Corporation") and Corporate Property Associates 9, L.P. (the "Landlord") entered into a Fourth Amendment to Lease Agreement (the "Fourth Amendment") pursuant to which the parties agreed to certain amendments to the Lease Agreement dated September 29, 1989, as amended (the "Lease"), entered into by and between the Corporation (as successor by merger with Space Data Corporation) and the Landlord (as successor by merger with Corporate Property Associates 8, L.P.).
Pursuant to the Fourth Amendment, the term of the Lease is extended to expire on September 29, 2019 and the Corporation has three remaining five-year renewal options. The Fourth Amendment further provides that, effective as of September 1, 2008, base rent is reduced to $2,770,560 per annum and will be subject to only one adjustment on October 1, 2014 in accordance with terms of the Lease. In addition, subject to certain terms and conditions, the Landlord agrees to reimburse to the Corporation up to $5,250,000 of the actual costs the Corporation incurs in making certain improvements to the leased premises. Any amounts reimbursed by the Landlord after the initial $1,250,000 will be amortized and repaid by the Corporation as additional rent with interest.
The foregoing description is qualified in its entirety by reference to the provisions of the Fourth Amendment, a copy of which is included as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference. Item 9.0l Financial Statements and Exhibits.
(d) Exhibits.

Exhibit No. Description 10.1 Fourth Amendment to Lease Agreement dated as of November 5, 2008, by and between Corporate Property Associates 9, L.P. and Orbital Sciences Corporation.

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