How to buy a house under GTA5 line?

The game is introduced:

Under the influence of the ancient tradition left by Italian immigrants, the family has become an important part of American gangster culture. For those lawless gangsters, family members and relatives have an unspeakable position in their hearts. This time, our protagonist, talented criminal Carl Qiang Sen (known as CJ by friends), after five years of quiet life, suddenly heard that his mother was killed in his hometown.

At this point, the "gangster blood" in his body is burning again, and now CJ will return to San Andreas and once again set off a new round of blood shed among the infighting underground forces. This time CJ will turn to his brother and revive the Orange Forest family.

The game stage of Grand Theft Auto San Andreas has moved from Florida to California. The fictional city of San Andreas consists of three cities (Los Santos based in Los Angeles, San Fiero based in San Francisco and Las Ventura based in Las Vegas) and miles of highways, deserts, mountains, rivers and lakes. The scope of San Andreas will be five or six times larger than that of the vice city.