It won't be 100% accurate, but it will be close enough.

It was not accurate.

It might be worth double-checking that estimate to ensure it's accurate for the area.Other than that, your costs and estimates look solid, but I'd recommend re-running the numbers with these tweaks.

I have been playing around with Propwire for the past few days and it makes me wonder how accurate the information is on the site compared to Propstream.

Their ability to accurately estimate the after-repair value (ARV) and confidence in their pricing allows them to exceed the 70% rule by 1% to 2%.Finally, experienced investors often have advantageous financing arrangements with banks.

However, your post is highly accurate on flat roofs.

It’s been 2-3 months using the software and I think it’s accurate but would love to know what others are using.  

I know how to get fantastically accurate estimates for simple single-family deals but was wondering if anyone had advice on where to start for running numbers for 50+ unit deals.Also, if anyone has any advice on helpful systems and technology - or for managing larger scale real estate businesses to be a valuable partner, I'd gladly listen. 

As long as you and your CPA maintain thorough and accurate records, you should be in good shape.

Their numbers were not anywhere close to accurate and we are paying the bulk of the mortgage out of pocket.