Is that sufficient information to calculate all the ratios and acronyms you've been mentioning in your posts?

I'd be cautious, building has most likely not been sufficiently upgraded or maintained.

If you are owner occupying with a 30 year fixed loan, minimum down for a 3 or 4 unit is 20% for conventional loan, $0 down using VA loan and FHA loan is not possible due to “self sufficiency” rule.

If all the previous is ok and you can't wedge a dime in the crack then you'll most likely be okay for a few years maybe more and cosmetic methods should work sufficiently. best advice is to have three or more well respected concrete contractors view the crack and give you their advise.

A simple analysis cuts through all the chaff.If you're trying to pitch deals to people who have some finance knowledge, but don't know much about real estate, then use a complex spreadsheet.If you're just trying to make a call if the deal is good or not, the simple analysis is sufficient.

Landlord reserves the right to hire professional cleaners and be reimbursed by Tenant if it is determined that Tenant is not sufficiently cleaning house."

A heating system must be sufficient to adequately supply heat at all times.I would send a notice to your landlord via certified mail stating the problems, when they first started, and when you first contacted the landlord about them.

Often Physical Signs like the "Smile, you're on Camera" are sufficient deterrents for the casual bandit crime of easy opportunity but if they are bent on pilfering they're coming in anyway.

Shouldn't they look to become self-sufficient before trying to cut taxes?

Feel free to direct your specific questions onto one of those threads if some method being given in such thread doesn't seem sufficiently clear.