to me there are credit lines and then there are credit lines.IE the vast majority have a heloc on their personal home or maybe a rental.. with a credit union local bank big bank etc.then you have credit Lines that are unsecured for business purposes .I have not heard of credit lines being frozen yet.. but I sure saw it a ton in the GFC.. and very few folks that get them on their personal resi or a rental.. actually read the fine print and therefor are shocked when they go to access their heloc for this deal they want and its frozen.our facilities are on one year terms with a mandatory 30 day rest per 12 months.. its been that way for me for 20 some years LOL.. mine are unsecured and of decent size i am not talking 50 to 100k..

Promoting the purchase, sale or exchange of real estate; [PL 1987, c. 395, Pt.

I read that several times and didn’t see anything from Airbnb about why they are continuing to deny trip insurance claims for refunds for cancellations due to CV-19 purposes - the very insurance that THEY marketed and sold to guests.I guess Airbnb exempts themselves from “extenuating circumstances.”  

Our community, left largely uncensored (except for the 5 "S" - Sales, Sleaze, Spam, Self-Promotion, Solicitation), has discussed how to handle a recession or similar economic environment ad nauseum, to steal a phrase from @Corby Goade.But, let's address your questions here specifically. 

It does depend on what your purpose is.  

I'm in the UK which has a complex situation with US taxes, but if I'm reading this below website correctly you may have an easier time if you are treated as a non-resident Australian for tax purposes.

I am not a tax expert, but one other thing you need to know, when you sell, there will be 20 percent withheld by the Gov for tax purposes for capital gains.

I have been saving up for the recession reserve and investment purposes but if this continues to June, the longterm economic consequence can be horrifying.  

I am not sure about 403(b) but 401(k) and 457(b) have the option to let you borrow money out of your account up to $50k or half of your vested account (which ever is less).You usually have a 5 years repayment plan (or sometime 10 years for some very narrow loan purposes).If a loan is offered by your custodian, usually you can get a check in a few days and they may charge a small administrative fee.The interest rate is usually a little bit above prime.The interest paid is going back to your retirement account.Now on the negative side:To get the loan out, you will have to sell some of your retirement asset to get liquidity.During the time of the loan, your retirement account will grow slower as there would be less money in it.If you separate from your employer you will have to repay the balance of the loan immediately.

It can b good or bad depending on the tenant. if they are messy and purposely try to make it difficult to show so they don't have to move, it can be a pain.