So it takes about 45 months to recapture your costs to update and retenant...that is if the new one stays for the 45 months and your lease assumptions are correct.Depending on where you are in DFW, you also might consider trying to get the lease on school year. 

These are presumably the few things that it makes sense from an economic / risk assumption perspective to have the tenant assume / perform.

Are you making assumptions that you will one day run things?

Note there are assumptions made even for the %4 but that is no the point of this post. 

Can't say the amount because there's not enough information given.This is really something that a good CPA should be able to figure out in 30-60 minutes and get it materially accurate subject to forward looking assumptions. 

Some assumptions: 20% down, 2.8% Interest Rate, 2.4% tax rateMonthly Analysis: Other tenant and I currently rent for $2150Mortgage + Taxes: (20% down, 2.8% interest rate, 2.4% tax rate): $1672Home Insurance: $140HOA: $115This takes total expenses to $1927 leaving $223 profit.

2) What are the FINANCIAL ASSUMPTIONS (how are you gonna pay for that)?

I just love how everyone here is making the assumption that these women are poor and will be homeless.

I think we can make assumptions but there is no way to get a definitive answer.

Then state your assumptions in your offer (I would write them down to point at if it looks worse than you thought).