The lease will give you some idea. The park management may tell you and if they're honest you'll get a good idea. But the best way by far is to ask a few of the other residents. Ask a few how long they've lived there, how often the rents go up, and by how much. That's what I've done, and found it very useful.
Hope that helps.
Although there is no date of manufacture on the listing I see that this home is obviously a pre HUD, built before June 15, 1976. If you are thinking about securing a loan for the purchase you will find that most lenders will not lend on a PRE HUD home. Additionally, you should be aware that many if not most Pre HUD homes were built with lots of caustic and carcinogenic chemicals i.e. formaldahyde and asbestos.
Be sure to have it thoroughly inspected by an experienced MH inspector and not just any home inspector as there are several nuances with MHs that you don't have in a conventional site-built home and most home inspectors not familiar with these nuances will not even know what to look for.
Make sure the inspector crawls under the home and thoroughly inspects each and every pier and pad assembly for rust, deterioration and decomposition if steel and for decompsition if concrete as homes that close to the ocean can be severely impacted by salt.
They should also make sure the home is level by checking all the doors and windows to make sure that they are not swinging or sticking and that all the strike plates on the doors are properly aligned and the doors close soundly.
The inspector should also inspect the steel mainframe for rust and decomposition as well. I can't tell you how many mainframes we've had to repair that were suffering and in some cases even failing from rust and deterioration related issues.
Be sure and have the inspector check for rips and tears in the vapor barrier under the floor. If there are openings in this membrane it could allow the insulation under the floor to become compromised and even fall on the ground.
Openings in the vapor barrier are also a great place for rodents and cats to habitate and reproduce. We've eradicated countless critters from these cavities over the years and it's not a very pleasant experience.
Finally and very importantly make sure the home has a state Housing and Coummunity Development Department (HCD) certified earthquake resistant bracing system (ERBS) as this area is classified as a Zone 4 earthquake area.
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