The assessed value is 120K.

I am new to REI as well I have found a few deals but struggle to assess where my PP should be.

Then add "real estate assessment" and/or "real estate tax" to your google search term (the county name) and this should point you to a website where you can look up property taxes and the assessment records for all properties in the county.

$8,100 to $11,400 with an assessment increase from $423k to $599k (was assessed at $670k and appealed it to $599k)$4,500 to $5,800 with an assessment increase from $242k to $315k (was assessed at $368k and appealed it to $315k)$4,600 to $5,400 with an assessment increase from $245k to $295k (was assessed at $345k and appealed it to $295k)

I agree with Bill's assessment. 

My input would be that we estimate that land on residential property is generally around 20% of the total property value as a rule of thumb.Here in TX, our local county appraisal districts break out land versus improvement values in the appraised values that they use to assess property taxes.

I thought it would be difficult, but with my background in construction, assessing the repairs needed to the property and the price I needed to secure the contract for was easier than I thought.  

If you live in the property then you get to homestead which reduces an amount from the assessed value, thereby, reducing your tax payment.

You need to assess the viability of renting the property.

You need to really check the % of owner occupied units and the HOA fees and any special assessments that they have or have had recently.