The appraisals on my past Alta statements have ranged from $450-$600. 

I have purchased 18 doors over the past 5 years and 100% of them have appreciated, all of the rents have gone up. 

They won’t lend past 60% CLTV.

I've found variations of this question posted in the past, and have benefited greatly from the answers.

That area has steadily declined over the past few decades. 

Is it already past your due diligence?  

I've done about 6 fix/ hold deals in the past year.

However, just in my limited knowledge and an attempt to contribute I think the general rule around is 10 loans to a name and then you'd need a portfolio lender to be doing anything past that.

My question is if I chose to sell the property today, will I be past the 1-year mark to be considered a long-term capital gain or is it based on when the property was put in "service" as my Tax form 4562 calls it aka rented out?

I just started reading Tax Strategies for the Savvy Real Estate Investor by  @Amanda Han and Matt McFarland and - while I haven't gotten past the chapter on Deductions quote yet - I suspect you can deduct them but there may be more details I am missing.