You have 4 kitchens, at least 4 bathrooms, more roof, walls, flooring, exterior, windows, and appliances   You need to place replacement cost and expected remaking lifetime on each item to derive a more accurate maintenance/cap ex.

In addition, why would you choose 10 year over the 30 year if the return is mostly derived from appreciation.  

According to the website of the Ministry Of Tourism in he Dominican Republic.On October 9, 2001, the National Congress approved Law No. 158-01 on promoting tourism development for areas with little development and new centers in provinces and localities with great potential, to accelerate a rationalized development process. of the tourism industry in all regions with potential and natural conditions for tourism exploitation throughout the Dominican territory.In the law above, the Tourism Promotion Council (CONFOTUR) was created, to apply the guidelines of Law No. 158-01, as well as create the conditions and facilities necessary so that innovative tourism projects can benefit from the incentives granted by law.Through Decree No. 372-14, the Technical Directorate of CONFOTUR was created, in charge of handling all technical matters derived from the application of Law No. 158-01 and its modifications.Classification application files, to comply with the terms of Law 158-01 and its modifications, must be sent through the CONFOTUR website by completing the Application Form.

Rehab estimates are nothing more than opinions... typically based on the exit strategy that is deemed most profitable by the comps used to derive the value of the subject property.  

As you pointed out, in your above example, it's not clear on what the 6%-10% to GP or the 10% 70/30 split is derived from.

The idea is that the percentage of the income that is derived from the debt financing is taxable.  

I will let others way in to confirm but I believe that BBB rating are bunk and mostly derived by the company paying to be rated.

If Rental Income is being derived from the Property being vacated by the Borrower, the Borrower must be relocating to an area more than 100 miles from the Borrower’s current Principal Residence.

Banks may in fact want more liquidity - since there is no income derived from owning land during the year. 

I have done a lot of analysis on MLS listings including the more detailed Frank Gallinelli version of using NOI and cash flow to derive IRR and shortlisted 4 multifamily units from 100s that I looked through that I want to pursue and which offer a good COC and cash flow per unit.