There are books out there that you can read to assist you in determining rehab costs/budgets without the need to hire someone before you are under contract to buy.

We are making an offer on an 1940 built home in down town Denver. This home is 750 sqft with 750 sqft in basement. Lot size 4500 sqft. There are tenants living in the home. Home is not well kept and needs a lot work...

This sounds like a property that you did a great job on the rehab making this a set it and forget it rental. 

I also love YNAB for personal budgeting and use it religiously (knowing your income/expenses to the penny is key to profitable money management), so for the past few months I've increased my savings by pretending I'm carrying a note on a BRRRR and paying money into an account as if I'm in the middle of a 6 month rehab phase.I recommend that if you haven't laid out a business plan yet, grab a pen and paper and start mapping out your goals and how you'll get there. 

Purchase price: $125,000 (assuming offer is accepted)Down payment: $25,000 (20%)Financing: 30 yr @ 5% = $540 /moInitial rehab: $5,000Closing cost: $2,0001st yr Insurance: $1440Taxes: $120 /moInsurance: $120 /moVacancy: $150 /mo (8%)Maint/Cap-Ex: $270 /mo (15%)TOTAL EXPENSES: $1200Rent: $450 /unitTOTAL INCOME: $1800Cashflow: $600 /moCash on Cash: 21.5%Here is a link to the listing if it may provide more insight:Quadplex ListingThe unit is located on a decent street in a very small town (<10,000).

The plan was to purchase, rehab/update (requires about $5k-$10k) and have it ready to resell by around winter/spring 2018 or earlier, in time for when the "snow birds" from the northern states are vacationing and looking for property to purchase.  

How do we contact one another since we cannot share phone numbers or email addresses on here? 

The softwares objective is to combine names and address from multiple list so you can find potential sellers with multiple areas of motivation for selling their house.  

HI BP, I want to borrow some funds off of my Dad for a quick rehab but he's new to the lending game and I've never borrowed short term before so we're both curious as to what's the norm for this type of loan?  

It would be in 5 small rehabs for buildings in green point BK.