LOLOk assuming this seller has 100% park owned homes ( configuration you really don't want, you want a park that is 100% tenant owned).  

One reason is that it is the most popular configuration and will be the easiest to sell or rent. 

For example, the "normal" property configuration in some neighborhoods are a 1-bedroom or a 2-bedroom. 

I would love to use Home Depot or Lowes, however my counter top configuration is a bit more custom in nature and I need an accurate installation.

Just add a .com to that to check out their web site.They come in a couple of styles (brass, nickel, bronze) and configurations (deadbolt, handle, etc.).

NO, but be advised these are easily HACKED so unless you're skilled and configuring WiFi,  caveat emptor.

Robto save yourself some troublesget you a broker to do your first deal this way you can see how it all falls togetheronce you have pulled one off you'll be able to configure the deals more to your likeningenjoy

Slabs under garages are often thinner than under the main house.You’ll need an architect to make sure you have adequate foundation to support the weight and configuration of the new unit. 

Will need new HVAC, new electric, new plumbing, new walls/configuration, and possibly dig out to create duplex down (two-level unit) or 3rd legal unit. 

Looking at deeds does not tell you whether a mortgage or other lien exists.To find any mortgages and liens that were recorded on the property, you can search in the County's official records (which for Clermont/Lake County is at https://officialrecords.lakecountyclerk.org/).You want to look for the owner's name(s) and the property address (depending on how you can configure the search) and look specifically for mortgages, liens, and satisfactions as the "instrument type".