You do not need a separate LLC for each property or a series LLC!

They make their living from this work and deal with more hassle than you can imagine, based on what I know from some of my realtor friends.

It may not be practical to have a contractor look at each property when you might examine 10-20 for each one you buy.

looking to accurate my rehab costs calculator, specifically in the Pittsburgh area.Of course, It varies from one investor to another, depending on the quality, standard, size, condition, and team.I am looking to get a range or see how much you pay for each remodeling. 1) what's your range for remodeling a kitchen completely (granit, backsplash, tiles, etc)?

Not in Bedroom, but yes in each bathroom. 

Here's an article with things to consider when selecting a cost segregation company.

Some investors prefer to start saving for these ASAP, while others plan to deal with them when they happen.The unknown is Maintenance costs, which are often dictated by how "hard" a tenant lives in a property.

But here’s something to keep in mind: when you sell a property, you usually have to deal with depreciation recapture, which is another type of tax.

Also, what are some other low cost amenities that I can add to my STR that will yield a higher ROI?

Cost segregation can be utilized for many different scenarios such as new construction, properties already owned and newly purchased properties.