It typically refers to the regular payments received by an investor from their real estate investment properties on a quarterly basis. This income can come from a variety of sources, including rental income, REIT dividend payments, and interest payments on real estate debt investments.

Quarterly income from rental properties would come from the rent paid by tenants on a quarterly basis. Landlords typically collect rent monthly, but some may choose to collect rent quarterly or at other durations. This income can be used to cover property expenses like mortgage payments, property taxes, and maintenance costs, as well as generate a profit for the investor.

Dividend payments to shareholders would be made quarterly by REITs, which are publicly traded companies that own and operate income-generating real estate assets. These dividends, which are typically paid out quarterly, can provide investors with a consistent stream of income from their real estate investments.

It would be paid in the form of interest payments for real estate debt investments such as mortgage-backed securities or real estate crowdfunding investments. According to the terms of the investment agreement, investors in these types of investments receive regular interest payments on a quarterly basis.

Overall, quarterly income in real estate investing can provide investors with a consistent source of cash flow while also helping in the diversification of their investment portfolio. However, before investing in any real estate investment opportunity, it is critical to carefully evaluate the risks and potential returns.