Chase has better business CC and sign-up bonuses and other financial products that help small businesses.

Tell them you’ll give them a $400 bonus do it within 5.

I found that they're a little on the pricier side, but they include a LOT of bonuses(Recall checks, mold warranty, etc.)

I look for properties that have existing space that is underutilized and not permitted to be habitable (in-law suite, granny flat, bonus room, hobby rooms, pool house).

I thought I was doing well getting 50% bonus with Chase Sapphire / Biz Ink... ha!

There are a slew of affordable housing bonuses available at the federal, state, and local level.

They have removed the density/height bonuses that incentivized green roofs, low/moderate-income housing, limited new build heights (intention of fewer 3 stories) and is forcing the hand of the developers to use more expensive building materials and processes. 

There are also bonus depreciation from from Furniture, landscaping, or appliances that can also be applicable. 

If it is just the labour that you don't have the money for, why not ask the contractor if they are willing to wait to be paid and given a bonus/interest when you sell it? 

It would allow you to accelerate your depreciation and take 100% bonus depreciation which would lower your net income, thus lowering your tax bill and keeping more money in your pocket to invest.