Add Leverage (Mortgage) and you greatly increase the ROI especially from the perspective of using Rents (other peoples money) to pay down the mortgage and increase your equity in the property over time. At this point then yes price appreciation is secondary bonus and we have an arguement of how and why Real Estate can be better than Growth Stocks in some scenarios and for some investors.

On August 4, 2003, Brad and Karen Murray’s marriage ended. They continued arguing over their assets for another four years. Brad worked as an independent broker for Ameriplan – a marketing company specializing in providing discounted rates on services related to healthcare. As part of his job, Brad sold monthly memberships to Ameriplan’s discounted health plans. He also recruited other brokers to do the same.
I agree mostly with the real estate advice. I’m looking for ways to take advantage of the condo I own to get up the rent from ~$0.90/ft to the $1.2-1.5/ft that seems more like the range in the same area. I’d have to put in a bit of capital (probably 10k on the low end for just the basics up to 40k if I wanted to remodel the kitchen and 2 bathrooms up to par with the area), so the return is likely there if those upgrades warrant $1.30/ft (given the unit is larger than most 2br/2ba in the area).
Residual income valuation (RIV; also, residual income model and residual income method, RIM) is an approach to equity valuation that formally accounts for the cost of equity capital. Here, "residual" means in excess of any opportunity costs measured relative to the book value of shareholders' equity; residual income (RI) is then the income generated by a firm after accounting for the true cost of capital. The approach is largely analogous to the EVA/MVA based approach, with similar logic and advantages. Residual Income valuation has its origins in Edwards & Bell (1961), Peasnell (1982), and Ohlson (1995).[1]
A different definition of residual income is that this is income derived from passive investments, rather than from a person's active income-generating activities. Examples are interest income, royalty income, rent, and increases in the value of investments held. Individuals typically work throughout their careers in order to build up a sufficient amount of this income to support them during their retirement.
There are two primary types of public REITs: traded and non-traded. Publicly-traded REITs offer the benefits of liquidity, because it is traded openly on a stock exchange. However, this liquidity is likely to be priced into the value of the shares, resulting in a “liquidity premium”, or a cost that all investors pay for the ability to buy and sell the asset whenever they wish. The liquidity premium results in lower relative returns for all investors, regardless of whether or not they choose to sell their shares. Furthermore, publicly-traded REITs tend to be correlated to broader market volatility, meaning that the share value may fluctuate depending on how the stock market is doing, regardless of whether or not anything has changed with the underlying properties owned by the REIT.

Residual income is the amount of net income generated in excess of the minimum rate of return. Residual income concepts have been used in a number of contexts, including as a measurement of internal corporate performance whereby a company's management team evaluates the return generated relative to the company's minimum required return. Alternatively, in personal finance, residual income is the level of income that an individual has after the deduction of all personal debts and expenses have been paid.