Most larger windows are an odd (old) size and solid pane and do not open.

This could cost around $500 to $1,500 per unit, depending on the size and complexity of the project.Certifications: There may be additional costs for certifications (such as HERS ratings) or third-party testing to verify the energy efficiency of each unit.For a 90-unit project, you could be looking at costs in the range of:$45,000 to $135,000 for energy modeling and certification (depending on the cost per unit).For a 112-unit project, the costs would likely be:$56,000 to $168,000 for similar services.Tax Credit Calculation:If you meet the energy standards, you can claim up to $2,000 per unit.

So not really a one sized fits all approach which is the nice thing about real estate being able to cater it to yourself and your goals. 

Long term money, you could invest into a taxable account so you have access to it whenever you want.

Quote from @Pamela Rivas: Hi Natasha,Here are some key points to consider about setting up a Mexican corporation:Setup Costs: $1,500–$3,000 USDOngoing Costs: $1,000–$2,000 USD/year (accounting and tax filings)Benefits: Tax deductions for expenses like maintenance, repairs, and managementBest for: Multiple properties or income-generating investmentsWhile a corporation is ideal for managing multiple properties, it’s NOT required to obtain an RFC.

(ie, lot size, variances, easements etc)They've been very helpful to me over the years. 

To make taxes easier we set up a business checking account and had all the rent paid into that account and all the expenses paid out of that account.

That higher interest will be a lower cost than the closing costs for the refinance so a net gain (depending on your new loan size). 

Market rate is $1100 on the same street for the same style, size, and age of house.The tenant has been there for 25 years and has also worked as a handyman for the landlord on various properties, so the current owner has asked me to keep him there for at least the next year before raising rents.Property taxes from 2023 are just north of $2000.Based on this Deal Calculator it should cashflow month 1.My questions:1.

[1]    You might want to think about opening 2 FDIC insured savings accounts that have no fees.