Eco Farmhouse [YMAP] by Dusted
This map adds a self-sufficient off-grid organic farm with a modern farmhouse. It is located along the Los Santos Freeway in Grand Senora Desert, Los Santos County, just to the north of Los Santos. The farm is close to Martin Madrazo's Ranch (La Fuente Blanca) in Vinewood Hills and there is also access from the Senora Road on the west side. The property features a three-story farmhouse with an interior, ecological agriculture, landscape garden, greenhouse, rain collectors, livestock, garage, helipad, storage, solar panels, wind turbine, and a gym in the garden.

[Requirements]

Download and install:
-ScriptHook V
-ScriptHook V.NET
-OpenIV
-Map Builder by OmegaKingMods
-Map Editor by Guadmaz with all the requirements

You can also install "Updated Object List For Map Editor" by A1Draco in case you need it or have missing Objects.

[Addon Installation]

Turn on OpenIV.

If you don't have a mods folder, create one and put the original "update" folder located in the GT5 main folder into your "mods" folder.

Copy and paste folder "custom_maps" to: mods\update\x64\dlcpacks\

After that add "<Item>dlcpacks:\custom_maps\</Item>" in dlclist.xml using OpenIV to: mods\update.rpf\common\data\
 

If you already have custom_maps folder then go to:
\mods\update\x64\dlcpacks\custom_maps\dlc.rpf\x64\levels\gta5\_citye\maps\custom_maps.rpf\

and add these files located inside "ymap" folder: 
backyard.ymap.xml
garage.ymap.xml
house.ymap.xml
landscape.ymap.xml

[Adding vehicles and peds]

Copy vehicles.xml and peds.xml located inside "xml" folder to your GTA main folder.
Now launch GTAV, press F7 to open Map Editor, select "load map", "file chooser", and load vehicles.xml and peds.xml.

Have Fun!