Original sentence: Blockbusting refers to a practice realtors adopted in which they would advertise the incoming presence of a black family to a neighborhood, causing panic among the white residents who would consequently sell their houses at deflated prices very quickly.Blockbusting strategies were also employed to instill fear in white neighborhoods and cause White Flight out of areas on the outskirts of the city.By 2020, residents' opposition to new housing has resulted in Palo Alto only allowing construction of enough low-income housing to meet 13% of its state-mandated share, and 6% of its share for very-low-income housing.However, for the most part, Palo Alto’s housing was built on policies that are still reflected in the current demographics.In 2010, Palo Alto ranked as the 2nd most expensive city in the United States, with a four-bedroom, two-bathroom home listing for $1.48 million on average.In the 1920's, racial covenants were used that banned “persons of African, Japanese, Chinese, or Mongolian descent” from purchasing or renting homes in many neighborhoods throughout Palo Alto.In the 1950's, some movements opposed these policies, including the Palo Alto Fair Play Association, as well as architect and developer Joseph Eichler, who built almost 3,000 homes in Palo Alto.On the other hand, the surrounding areas were all marked Type C and D, and African Americans found themselves being driven to the outskirts of Palo Alto, what is now mostly East Palo Alto, where there was no money from loans in the economy, leading to a state of decay.One famous blockbusting event is responsible for the prevailing demographic divides between Palo Alto and East Palo Alto.One of the most destructive policies at the time was redlining.Palo Alto is by some measures the most expensive college town in the United States.Palo Alto is one of the five most expensive cities in the United States to live in, and its residents are among the highest educated in the country.Palo Alto ranked in as the 5th most expensive city in the United States , with an average home sales price of $1,677,000.Palo Alto’s White neighborhoods were ranked mostly Type A and B, allowing for wealth accumulation and eventually resulting in the high housing prices we see today.Redlining was a policy put in place by the Federal Housing Association starting in 1937.Residents in Type D neighborhoods were ineligible for loans to buy or fix houses.The median home sale price for all of Palo Alto was $1.2 million in 2007 and $1.4 million in July 2009.The program was implemented in a way so that neighborhoods with any kind of African American population were ranked type C or D.This was also the case in Palo Alto and the surrounding areas.Through the program, the association could rank neighborhoods from Type A, which was desirable, to Type D (outlined in red) which was deemed hazardous.While the city contains homes that now cost anywhere from $800,000 to well over $40 million, much of Palo Alto's housing stock is in the style of California mid-century middle-class suburbia.[note:  the cited reference does not provide information to support this assertion, and in fact contains very little mention of Palo Alto at all]
Edited sentence: 1 Of the estimated 28,500 housing units in the City, approximately 62 percent are single family residential units.As with many other Silicon Valley jurisdictions, the demand for housing exceeds housing supply, thus escalating housing prices.Its housing stock provides a number of housing types, including single family homes, townhomes, condominiums, apartments and one mobile home park.The City is nearly built out, with only 0.5 percent of the developable land vacant and no opportunities to annex additional areas to accommodate future housing needs.The City of Palo Alto can be described as a suburban residential community with a vibrant economy in the high technology and medical sectors