Fha 203k- Descrepancy in units on property vs with county

[Caroline Powell]

Hi there!

I have found a rental property that I would like to purchase using an fha 203k loan. 

here's my issue that I can't seem to Google my way out of.

The property is listed as having 4 units with the county but there are actually 5 units.  There's four 1 bedroom/1bath in the main building and a garage apartment with a 1/1.

I know fha 203k is only for 4 units.  However, I'd convert the 2 lower units to a 3/2 for myself and my children to live in.

Would the fha approval go off of what the county states, as the property only having 4 units?

Or would an appraiser do a new appraisal and put down 5 units blowing it?

Ive also researched here about covering 5 units to 4 and some have referenced you can change a 5 unit to a 4 or have it in your plans and still get an approval...

But others say no. 

Help!