(Corrects paragraph 2 to say “total consideration can increase to as much as $19.51 per share” and clarifies break-up fee condition) July 21 (Reuters) - U.S. investment firm Starwood Capital Group on Wednesday sweetened its offer for Monmouth Real Estate Investment Corp to $18.88 per share from its previous bid of $18.70. The total consideration can increase to as much as $19.51 per share in case Monmouth does not pay a break-up fee of $62.2 million to Equity Commonwealth or pays a lower fee, Starwood said. (Reporting by Shreyasee Raj in Bengaluru; editing by Uttaresh.V) Our Standards: The Thomson Reuters Trust Principles.