Jones Lang LaSalle Incorporated (JLL) is a global real estate services company, founded in the United Kingdom with offices in 80 countries.

[9] William Sanders founded the real estate company International Development Corp in 1966 in El Paso, Texas.

[13] The company expanded from commercial real estate services to include property technology, or "proptech", with the 2017 launch of its JLL Spark division.

[17] In June 2018, JLL Spark created a $100 million venture fund to invest in real estate start-ups, such as a technology to link office users with co-working spaces.

[23] In August 2021, JLL announced the acquisition of Skyline Al which is an AI platform that provides a comprehensive analysis of commercial real estate properties.

[27] The company developed a large language model (LLM) tool called JLL GPT for its employees, and launched it in August 2023.

[28] The generative AI model is being trained on JLL's data as of 2023 and was developed to be able to answer questions about commercial real estate.

[30] According to the company, the platform is intended to collect data and provide reporting on JLL's clients' environmental sustainability goals, including decarbonization.

[34] JLL is headquartered in Chicago, Illinois, and as of October 2018 was the second-largest, by total transactions, public brokerage firm in the world ($162.12 billion).