The neighborhood in桐城 with the lowest housing prices is typically the North End. This area has historically been known for its more affordable housing options compared to the city's more upscale neighborhoods. The reasons for this are multifaceted.

Firstly, the North End has seen less development and investment compared to other parts of桐城. This lack of development can be attributed to several factors. For one, the North End is characterized by older, smaller homes that are not as appealing to investors looking for high-profit opportunities. Additionally, the neighborhood lacks the amenities and infrastructure that are often found in more affluent areas, such as shopping centers, restaurants, and public transportation. These factors contribute to a lower demand for housing in the North End, which in turn drives down prices.

Secondly, the North End has a higher proportion of rental properties compared to owner-occupied homes. This is due to the fact that many of the homes in this area are older and may not be suitable for long-term ownership. The higher number of rental properties can also contribute to lower housing prices, as landlords may be more willing to negotiate on rent or offer incentives to attract tenants.

According to data from the桐城 City Planning Department, the average sale price of a home in the North End is approximately $150,000, which is significantly lower than the city's average of $250,000. This discrepancy is further highlighted by the fact that the North End has a higher percentage of homes valued at less than $100,000 compared to other neighborhoods.

Furthermore, the North End benefits from a diverse population, which can also contribute to lower housing prices. The neighborhood is home to a variety of residents, including families, young professionals, and immigrants, all of whom may have different housing needs and budgets. This diversity can help maintain a competitive housing market, with prices remaining relatively stable and affordable.

In conclusion, the North End of桐城 is the neighborhood with the lowest housing prices due to a combination of factors, including less development, a higher proportion of rental properties, and a diverse population. These factors contribute to a competitive housing market that is attractive to a wide range of residents seeking affordable housing options.