I tend to agree with @Aly W. are certainly a major factor and are being redefined more regularly these days so being up to date is important.
As for taxes, to get an initial estimate I've actually found zillow to be fairly helpful there...rough estimate.
GRM: well Palm Bay is an interesting area when looking at GRM and the 2% rule....
First, I would say there are fewer duplex and quad units in Palm Bay then a lot of other areas. It's mainly dominated by SFRs and then there are a lot of condos in the general area once you get closer to the beach and also in older Melbourne. The one triplex I viewed would have barely made the "1%" rule which was a non-starter for me.
It feels like 2% can be fairly illusive for general buy and hold but there is opportunity.
I've noticed that rents are much more stable across areas here where the retail purchase price swings more dramatically over the same region....so there can be a sweet spot at lower value properties that likely will not appreciate much but will have much stronger GRM and NOI.
There are actually still some condos in the area that sell below $40k and make $800+/mo but those are the deals and not the average place.
I feel like the largest opportunities for this area are the distressed and REOs that will be some rehab then hold and rent. The banks are finally starting to accept more reasonable offers and negotiate.
There are also other investors in the area doing larger rehabs and selling at prices that target investors (leaving enough in the deal to make it a good cash flow investment).
I think all that can be summed up by saying good research or boots on the ground here can still net some great investments.
-Keith