Their only advantage is flexibility and that's not how you are planning to use it.

The HELOC is far more flexible. 

Please note that the account into which the funds are deposited must be the same type of account from which the funds were first withdrawn (e.g. withdrawal of pre-tax funds from a 401k could be deposited in a pre-tax IRA but not a Roth IRA - "like to like").Loans:Payments on a 401k loan taken under the CARES Act must be paid back starting in 2021 over a 5 year term.Here are the details regarding the loans:NEW LOANS:The CARES Act which was enacted to provide relief to individuals impacted by COVID-19 allows for increased 401k loans and more flexibility for repayment of these loans.Specifically, you must be an individual who meets one of the following conditions to demonstrate that you have been impacted by the crisis (and it will be your responsibility to retain documents in your files that demonstrates that you are a qualified individual):Individual who is diagnosed with COVID-19, with a CDC-approved test;Individual whose spouse or dependent is diagnosed with COVID-19, with a CDC-approved test; ORIndividual who experiences adverse financial consequences as a result of being quarantined, furloughed, laid off, having work hours reduced, being unable to work due to lack of child care due to COVID-19, closing or reducing hours of a business owned or operated by the individual due to COVID-19; or other factors as determined by the Treasury Secretary.On or before September 23, 2020, such individuals take a 401k participant loan subject to the following terms:Maximum Amount of the Loan: 100% of their 401k balance not to exceed $100,000.

Some sellers may be okay with this and others may want to be in the first position if they are being flexible and offering the seller financing.

It is very flexible.

Covid has kickstarted my RE investment career allowing me more freedom and flexibility to perform my work duties while also spending significant hours and mindshare on my own aspirations.

Please note that the account into which the funds are deposited must be the same type of account from which the funds were first withdrawn (e.g. withdrawal of pre-tax funds from a 401k could be deposited in a pre-tax IRA but not a Roth IRA - "like to like").Loans:Payments on a 401k loan taken under the CARES Act must be paid back starting in 2021 over a 5 year term.Here are the details regarding the loans:NEW LOANS:The CARES Act which was enacted to provide relief to individuals impacted by COVID-19 allows for increased 401k loans and more flexibility for repayment of these loans.Specifically, you must be an individual who meets one of the following conditions to demonstrate that you have been impacted by the crisis (and it will be your responsibility to retain documents in your files that demonstrates that you are a qualified individual):Individual who is diagnosed with COVID-19, with a CDC-approved test;Individual whose spouse or dependent is diagnosed with COVID-19, with a CDC-approved test; ORIndividual who experiences adverse financial consequences as a result of being quarantined, furloughed, laid off, having work hours reduced, being unable to work due to lack of child care due to COVID-19, closing or reducing hours of a business owned or operated by the individual due to COVID-19; or other factors as determined by the Treasury Secretary.On or before September 23, 2020, such individuals take a 401k participant loan subject to the following terms:Maximum Amount of the Loan: 100% of their 401k balance not to exceed $100,000.

Finding 6-month or flexible rentals is difficult. 3.

This means more flexibility as a landlord. 

Smaller or local (to the area you are buying in) companies are more likely to be more flexible with lending since they will keep the loan on their own books.