You should be able to find this offer under your Amex online account or you can also add with Twitter using #AmexRenaissance.
Renaissance Hotels are one of Marriott brands and is not as widely available as other Marriott brands. Los Angeles has only 3 hotels
Note that this offer is only available for stays at Renaissance Hotels (excludes other Marriott brands) in US and US territories, and must be booked directly with the hotel (not eligible for stays booked through Priceline, Expedia etc..).
Here are the complete terms & conditions
Enrollment limited. Reservations must be made online at renaissance-hotels.marriott.com, via the Marriott mobile app, or by phone. Offer valid only at Renaissance Hotels brand properties in the US and US territories. Excludes gift card purchases. Excludes purchases made at the Collect Renaissance shop. Offer not valid for stays that are paid for before or after the promotion start and end dates. Excludes The Ritz-Carlton®, Bvlgari® Hotels & Resorts, JW Marriott®, EDITION®, Autograph Collection® Hotels, AC Hotels by Marriott®, Moxy Hotels®, Marriott Hotels®, Delta Hotels & Resorts®, Courtyard® by Marriott, Springhill Suites® by Marriott, Fairfield Inn & Suites® by Marriott, Protea Hotels®, Residence Inn® by Marriott, TownePlace Suites® by Marriott, Marriott Executive Apartments®, Gaylord Hotels® and Marriott Vacation Club®. Please note that hotels, car rental companies, cruise lines do not accept prepaid cards for charges authorized in advance, although prepaid cards may be used to settle the final bill. Check to make sure prepaid cards are accepted before attempting to use your prepaid card to take advantage of offers for these merchants. Corporate Cards are not eligible for this offer. Must add offer to Card and use same Card to redeem. Only US-issued American Express® Cards are eligible for this offer. Limit 1 statement credit per American Express Card across all American Express offer channels. Statement credit will appear on your billing statement within 90 days after 11/30/2015, provided that American Express receives information from the merchant about your qualifying purchase. Note that American Express may not receive information about your qualifying purchase from merchant until all items from your qualifying purchase have been provided by merchant. Statement credit may be reversed if qualifying purchase is cancelled. If American Express does not receive information that identifies your transaction as qualifying for the offer, you will not receive the statement credit. For example, your transaction will not qualify if it is not made directly with the merchant. In addition, in most cases, you will not receive the statement credit if your transaction is made with an electronic wallet or through a third party or if the merchant uses a mobile or wireless card reader to process it. By adding an offer to a Card, you agree that American Express may send you communications about the offer. POID: BW3F:0001
If you find a Renaissance Hotels that sells Marriott chain gift cards, you may be able to buy them for $200 or more and get the statement credit. Online gift cards purchases are not eligible for statement credit.
You could use the gift cards for future stays or at a different Marriott property. The challenge would be finding a hotel near by.
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