What they will offer you is an appliance package, or closing cost help, or a low fixed rate loan. 

We moved to Mexico to lower our monthly cost.

Is it common for developers to use subsidies to cover 100% of the construction costs without needing to obtaining debt or raising equity?

What costs/fees should I look out for?

Can she pay you that same amount to cover some of the costs? 

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

Coin jams are going to be your second biggest headache unless you invest in those fancy ones with tap-to-pay but those cost a pretty penny.

Your estimate seems low, but even at that cost, it will not add that value.  

This is the percentage of costs (purchase and rehab) covered by the loan.