It's simply your preferred return multiplied by the beginning capital.

Looking for advice on how to expand my business and grow my company by keeping up with the demand of new construction custom homes

Just like the gains are multiplied the losses could be multiplied!

The taxes I just used the proposed tax rate off of the county website multiplied by the purchase price (I know that’s not going to be entirely accurate but I thought it was a decent starting point).

Add the 5 rental amounts, multiply by 12 months, and you have annual gross of $52,200. 

If you do have an angle, you might, say, become someone's mentee, or learn you have a gift for this or that, and then you could multiply and morph that $10k into $1,000,000 in a few years.

You also back into it by taking the known ROI you require and multiply that by the spend, this will tell you how much you need in a rent bump to justify it.Me personally, I use between 20-25% ROI as my threshold.Another thought to this is if you can do this for 20 units and do secure the $100 rent bump then you just made the property worth 400k more assuming a 6 CAP or 300k if using an 8 CAP. this will help when time to sell or do a cash-out refi or supplemental loan.    

Multi-Ply / Ply Core• Higher stability and less shifting.

figure out what a conservative ARV is for the property, then multiply by .75 (or .8 if you can definitely get that), then subtract 6k, then subtract closing costs / holding costs, then that number is your offer price. 

Remember houses multiply.