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What Is A Commercial Mortgage Backed Security (CMBS)?


Commercial Mortgage Backed Securities (CMBS) are a liquidity source for commercial lenders and commercial real estate investors. They are more complicated and volatile than conventional mortgage-backed securities, and as such, the absence of guidelines to standardize the architecture of CMBS may be exceedingly challenging.

Examples of commercial mortgage backed securities are debt obligations backed by a pool of loans on commercial properties such as office buildings, shopping centers, hotels, and apartments. CMBS issues are often structured in many tranches, comparable to collateralized mortgage obligations (CMO).

Here’s what you should know before making this investment.

What Is a CMBS and How Does It Work?

CMBS is a debt instrument with an organizational structure somewhat dissimilar to that of a mutual-fund or an exchange-traded fund. They’re in the form of bonds, and the underlying loans are usually contained within trusts.

CMBS bonds are pools of debt that pay bondholders periodically. The idea is to classify a variety of obligations as one loan for investment and interest payments.

Banks combine commercial loans, such as those for developing new apartments or office buildings, to produce CMBS. The mortgages are usually put in a trust that administers this loan portfolio, which is considered one asset. After that, the financial institution will offer stock in the portfolio for sale. Investors get profits from the commercial borrowers’ principal and interest payments, which make up the portfolio of commercial mortgages.

Because it is a financial product consisting of debts, commercial mortgage securities are offered on the bond market. It invests in stocks by combining various assets into a portfolio and selling shares of that portfolio.

The conditions of a CMBS loan are often written into the underlying commercial mortgages by the lending institution. In this way, the lender may tailor the loan’s interest rate, repayment schedule, and other conditions to the requirements of the CMBS portfolio it is building. As a result, borrowers are motivated to agree to this, as the interest rates on these loans are more favorable.

CMBS Returns

A CMBS has its own interest rate and credit rating because it is a separate bond instrument. These are derived from the CMBS portfolio’s underlying bond collection. A business mortgage security may include several mortgages from multiple borrowers, making credit rating problematic.

CMBS’s investors are paid a percentage of the portfolio’s profits. Basic security pays note holders regularly based on underlying borrowers’ loan payments. Interest, rate of payment, nonpayment on the underlying mortgages, and collections, such as seized and auctioned properties on defaulted mortgages, influence CMBS returns.

There is danger involved, just as with other kinds of debt. A CMBS’s interest rate might change depending on the performance of the underlying borrowers. The rate of return on the bond will be adjusted downward if the developers default on their payments or go bankrupt.

This is a drawback, yet it also increases the asset’s marketability. A commercial mortgage-backed security is not a bond but rather a pool of loans. A larger number of debtors means that the portfolio’s value will not plummet if even one defaults.


Like other debt instruments, the rate of return on a CMBS is proportional to the level of risk involved. Based on asset risk, lenders segment their portfolios. Due to the reduced interest paid by more eligible borrowers, low-risk securities are called high quality and have good credit ratings.

There is a correlation between the quality and risk of a CMBS and the return it offers. This is due to the underlying debtors’ higher interest rates and increased risk of non-payment.

Why is This Familiar?

Collateralized mortgage-backed securities are an example of a derivative. The value of the product is derived from the performance of other assets. It is also a collateralized debt obligation since it is a collection of obligations secured by a pool of assets.

CMBS resembles mortgage-backed securities that caused the 2008 financial crisis. Both mortgage-backed securities provided returns depending on portfolio members’ mortgage payments.

The main distinction is that CMBS is based on business mortgages, not residential mortgages like the 2008 securities. Business borrowers usually have more valuable assets and are more likely to pay, making commercial borrowers more reliable security.

Final Thoughts

One option to invest in real estate is using commercial mortgage-backed securities. It is a kind of bond constructed based on a portfolio of commercial mortgages that serve as its underlying asset base. The rate of return is calculated from the borrowers’ principal and interest payments.