This paper examines the capital structure of Real Estate Investment Trusts (REITs) to understand how they choose between different financing options. It analyzes whether there is a relationship between market-to-book ratios and leverage ratios for REITs, and whether market-to-book ratios have a temporary or long-term impact on leverage. The paper finds that REITs with high market-to-book ratios tend to have high leverage ratios, and that historical market-to-book ratios have a long-term persistent impact on current leverage ratios. These findings support pecking order theory for REIT capital structures.