Second, neither Mobile or Manufactured Homes have ever been built on a slab. They are either place on a pad and pier support system and/or a perimeter stem wall. I'm not aware of MH's ever being placed on a "slab".
If it's a rent/lease park/community your rent can be all over the map depending on the location, management rental increase policy, if the community is in a rent control area and/or if it is close to a beach or in a high end MH community with lots of nice amenities, etc.
If the MH is located in a resident owned community/development you will most likely pay HOA fees. and property taxes. If on a private parcel you would pay property taxes providing the home is on an engineered certified foundation system. If not you would pay property taxes on the land and personal property taxes on the MH (chattel).
You really should start with the park manager. You will have to fill out an application and be approved by them before you even make an offer on a manufactured home in a rental park. At this time you will know what their rental rate increases are.
If the home isn't located in a rent control area then most managers will adjust the rent annually according to the "Consumer Price Index" (CPI) which can vary between 1 to 3 percent depending on inflation and a few other variables.
Very few manager/owners tend to gouge their residents unless they're dealing with the burden of deferred maintenance, infrastructure issues or high vacancy problems. But this you could determine yourself simply by driving through the park/development and observing the vacancies, homes for sale and speaking directly with some of the residents who may be outside.
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 decomposition if concrete as homes 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 California State Housing and Community Development Department (HCD) certified earthquake resistant bracing system (ERBS) as most areas in California are classified as a Zone 4 earthquake area which holds a high probability of risk for a seismic event..
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I would say run as far as you can from a mobile in a park where you lease the land. Unless you can get a real bargain. Here is why:
The owners of the park and and do raise rates when ever they want and there is nothing you can do about it, even moving the home is not a feasible option. So you can pick these things up for real cheap. Even then you may end up walking away from your investment.
You can get into a regular house in Palm City right now for a song and a dance. So w;hy would you do a mobile home?
Give me a call I can tell you what your payment would be, how much you could qualify for and then go out and compare that to the mobile home. Then if you go with the mobile, it would only be if it is a smoking hot deal.