```php
function buy_a_house_init()
{
    //triggers
    house1trigger = GetEnt("house_trigger_1", "targetname");
    house2trigger = GetEnt("house_trigger_2", "targetname");
    house3trigger = GetEnt("house_trigger_3", "targetname");
    house4trigger = GetEnt("house_trigger_4", "targetname");
    house5trigger = GetEnt("house_trigger_5", "targetname");

    level.currentHouse = undefined;

    //make each house lever work
    house1trigger thread trigger_house(GetEnt("house_lever_1", "targetname"),GetEntArray("house1", "targetname"),1500);
    house2trigger thread trigger_house(GetEnt("house_lever_2", "targetname"),GetEntArray("house2", "targetname"),2500);
    house3trigger thread trigger_house(GetEnt("house_lever_3", "targetname"),GetEntArray("house3", "targetname"),5000);
    house4trigger thread trigger_house(GetEnt("house_lever_4", "targetname"),GetEntArray("house4", "targetname"),7500);
    house5trigger thread trigger_house(GetEnt("house_lever_5", "targetname"),GetEntArray("house5", "targetname"),10000);
}

function trigger_house(lever,house,lever_cost)
{
    foreach(part in house)
        part MoveZ(-1000,0.05);

    self SetCursorHint("HINT_NOICON");
    self SetHintString("Hold ^3^1&&1^3 ^7to purchase House Upgrade");

    while(1)
    {
        self waittill("trigger", player);
        if(player.score < lever_cost)
        {
            self SetHintString("You Don't Have Enough Money");
            wait 1.5;
            continue;
        }
        player zm_score::minus_to_player_score(lever_cost);
        self SetHintString("This house has been upgraded");

        //remove old house
        if(isDefined(level.currentHouse))
        {
            foreach(part in level.currentHouse)
                part MoveZ(-1000,3);
        }
        level.currentHouse = house;
        break;
    }
    foreach(part in house)
        part MoveZ(1000,3);
    lever RotateTo((0, 0, 135), 1, 0.5);
}

function teleportplayers()
{
    node = (0,0,0);
    foreach(player in GetPlayers())
    {
        player SetOrigin(node);
        node += (100,0,0);
        wait 0.05;
    }
}
```