Your house is 100% rental property. Once you convert your property to rental use, it is a business property.
The question about business portion refers to a vacation home where there is both personal and business use due to occupying it and having short term rental situations or to a multi-unit property such as a duplex or apartment building where the owner rents out a portion and occupies another portion simutaneously.
Your land value would be the current value, not the original 2008 value.
