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IRS Publication - Instructions for Form 7004 (Address of where to file: pgs. 5 - 6): https://www.irs.gov/pub/irs-pdf/i7004.pdf

Department of the Treasury 
Internal Revenue Service Center 
Cincinnati, OH 45999-0045

How do I file an extension for a corporation, partnership, trust, or estate (Form 7004)? https://ttlc.intuit.com/replies/3301655