Xuzhou real estate prices can sustain their current levels for the next 5-7 years, assuming several factors remain constant. This projection is based on a combination of economic stability, population growth, and infrastructure development in the region.

The primary reasons for this sustainability are as follows:

1. Economic Stability: Xuzhou's economy has been growing steadily, with a focus on manufacturing and technology sectors. This economic growth has led to increased employment opportunities, attracting both domestic and foreign investors. According to the Xuzhou Statistical Bureau, the GDP of Xuzhou has been growing at an average annual rate of 7-8% over the past five years.

2. Population Growth: The population of Xuzhou has been expanding, driven by both natural growth and migration. The city's population reached 4.5 million in 2020, and it is expected to continue growing at a rate of 1-2% annually. This population growth creates a strong demand for housing, which supports real estate prices.

3. Infrastructure Development: The city has been investing heavily in infrastructure, including transportation, education, and healthcare. The construction of new roads, bridges, and public transportation systems has improved connectivity within the city and with surrounding areas. This infrastructure development has made Xuzhou more attractive to investors and residents, further supporting real estate prices.

Data from the China Real Estate Index System (CREIS) indicates that Xuzhou's real estate prices have been increasing at an average annual rate of 5-6% over the past five years. This growth rate is expected to continue, given the factors mentioned above.

However, it is important to note that several risks could impact the sustainability of Xuzhou's real estate market:

1. Economic Downturn: A global or national economic downturn could negatively impact Xuzhou's economy, leading to a decrease in demand for real estate.

2. Over-Development: If the city experiences over-development, it could lead to a surplus of housing supply, which could put downward pressure on prices.

3. Regulatory Changes: Changes in government policies, such as stricter mortgage regulations or property taxes, could also impact the real estate market.

In conclusion, Xuzhou's real estate prices can sustain their current levels for the next 5-7 years, assuming economic stability, population growth, and infrastructure development continue. However, it is crucial to monitor the potential risks and adjust projections accordingly.