The gross rental yield in real estate is somewhat similar to the free cash flow yield in equities. The higher the yield, the cheaper the property (all else held equal).

Property in Baltimore, Maryland has a 28.9% rental yield in 2020. https://www.worldpropertyjournal.com/real-estate-news/united-states/irvine/real-estate-news-attom-data-solutions-q1-2020-single-family-rental-market-report-best-markets-for-buying-single-family-rental-properties-in-2020-todd-teta-11863.php

This is followed by:

-Cumberland County, New Jersey (20.1%)
-Bibb County, Georgia (18.2%)
-Mobile County, Alabama (15.7%)
-Clayton County, Georgia (15.1%)

Among big cities, the highest rental yields are:

-Wayne County (Detroit) 14.5%
-Cuyahoga County (Cleveland) 11.8%
-Cook County (Chicago) 9.3%
-Dallas County (Dallas) 9.1%
-Harris County (Houston) 8.7%

Property in San Francisco has the lowest rental yield (3.8%).

The cities with the highest rental yields worldwide are:

1. Chisinau, Moldova (10.0%)
2. Kingston, Jamaica (9.75%)
3. Cairo, Egypt (9.4%)
4. Kiev, Ukraine (9.09%)
5. Amman, Jordan (8.82%)

https://www.globalpropertyguide.com/rental-yields 

6. Accra, Ghana (8.81%)
7. Dar es Salaam, Tanzania (8.57%)
8. San Salvador, El Salvador (8.49%)
9. Bahamas (8.16%)
10. Managua, Nicaragua (7.7%)

Istanbul, Turkey has the lowest rental yield (1.93%).