San Diego is very geographically unique vs the entire planet.

Each category will be different and unique. 

It's unique in size and structure for the area.How much time and money would it take to get this changed to a legal 4plex, if at all possible?

Using the 1% rule as a proxy, the price range should be around $410k.

Should I have a general purchase price range in my head when I start receiving calls?

That second name should be on the manufacturer's label which is located under the sink by the hot water heater in the closet of the master bedroom it will tell you all the information about it you do need to have someone look underneath the home to make sure the frame is still in good shape and that the axles are still in good shape and that there is a tongue with that home also getting that home down in the five to $10,000 range would be a good idea considering the work that you need to do to it you have to make sure that it is braced for a ceiling fan if you're going to add one the trim that's in there is it thats that flimsy trim or is it a good court around there's a whole bunch you have to look at buying parts for manufactured homes there are in certain places in building Centers.

I would try to get above 1% in rent as property taxes in Houston range from 2.5 to 3.5%.

Their way of being unique in their own way. 

Dundalk is a great place to find rentals in that price range.

Are homeowners buying in that price range or would it more likely be a landlord?