Plumbing seems to be the most variable of the trades as far as pricing.  

You can use the $300k+ in equity as your down payment and you roll into the new property tax free.I sold 1 condo in San Diego and traded for a $1.3 million 14 plex in Kansas City MO about 6 months ago.

So there is nothing about the consequences of not mowing or what height is acceptable.

This company is slicing up commercial real estate and giving investors the option to trade it on the blockchain! 

Something I didn't realize or think about is people trading in mobile homes like they trade in cars.

Previously this would have been deductible, subject to limitation, on the taxpayer's Schedule A.A home office deduction for a sole proprietor and an owner of rentals whose rentals rise to the level of a trade or business, and has no other primary workplace most certainly remains deductible for the 2018 tax year.

Don't know if its much help as I am a New Zealander by trade so the laws around here are quite a bit different.

I'd say $100/sf for a gut rehab, including new electrical and plumbing and roofing, some wall moving, maybe 50% new drywall throughout, new mechanicals, and all surfaces was a good estimate in 2018/19 for a 1950/60 era in San Diego IF you're GCing yourself and using licensed guys for the key trades. 

I suspect that if this were a thing I’d have heard of it by now.These types of credit lines are common in stock trading accounts for the purpose of buying more stock, because there are mechanisms to immediately liquidate the underlying securities if they decline in value.  

Since it's all a house of cards, the idea at this point is to not be part of the deck being used.I like Rabobank's assessment:"We live in a world of no consequences and everyone around us is corrupt". - until the shell game ends and it all collapses