Housing: housing information management, real estate dictionary, housing collection, transaction contract, etc.
Customers: information management, customer visits, customer follow-up, etc.
Person: account management, personnel promotion, personnel files, etc.
If you want to develop it yourself, you can refer to the better ones on the market, but it should be noted that the development cost ranges from several million to tens of millions. You can also directly use the software developed by software vendors, such as Fang Online and Fang You.