my condolences on your recent lost.there are a few ways you can do this, as mentioned above you can take a heloc on your primary residence which will give you a second mortgage, first mortgage payment wont be impacted. you can do cash out refinance which will give you one mortgage and payment. it will pay the old mortgage and give you money in your pocket to pay for the rehab.or you can do a renovation refinance which is similar to cash out refinance but we would contractor involved  as part of the refinancing and they are paid through the loan

How much should I consider the impact to the higher interest rates of today?

The real estate investing industry uses "Classes" to rank property performance risk, but there's NO agreed upon industry model:(Here's what we use for our Metro Detroit market:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

.- Taxes: While the 10% penalty is waived, the withdrawn amount will still be subject to regular income taxes.This can be a useful way to access funds for a home purchase, but keep in mind the tax implications and the potential impact on your retirement savings.

This directly impacts returns for everyone.

It absolutely matters what the GP is making on the deal, because it impacts the risk-return for LPs.If the GP is taking a crazy high amount, that amount is coming out of LP returns, which means that the LP might not be adequately compensated for the amount of risk they are taking by investing. 

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Using a 1031 to upgrade to a two-family could help you reduce or eliminate the $1,000 out-of-pocket expense you’re paying now.Also, condos often come with HOA fees that limit cash flow, so be mindful of their impact.

The only way to make it happen is to sell some property.It will impact my cash flow.

My problem is how to measure if it has any impact on sales price or time on market.