More REIT IPOs are in the works, with the filing of the necessary documents with the Securities and Exchange Commission by Brookfield Realty Trust and Marathon Real Estate Trust on Friday for entities that will invest $500 million and $300 million in various kinds of debt. Brookfield said it will use the money to originate and buy mortgage loans, and mezzanine loans, and possibly CMBS. As for Marathon, it will go shopping for MBS, mortgage loans and other real estate-related loans.