For long-term buy and hold, would you take on a house that has foundation issues?  

I’m not particularly worried about them, they always pay on time and I’ve never had any major issues with them.

The best way to mitigate the 45 day issue is to shop early shop hard and get into contract as soon as you can. 

That's one of the issues with high crime areas.

What is there issue supplying the rent roll?

Going in with a rationale for a price might make things easier if the seller takes issue with it.

@Ben Miculob  Ben, if you are using a hard money lender because you are rehabbing the house and you use an LLC to buy the property, you will have some issues refinancing. 

Also be sure to inspect prior to lease renewal in case you need to use it as leverage for correcting any issues before agreeing to renew or find something that merits non-renewal.sample letter:Tenant, Thanks for being a valued resident over the past XXXX!

If you have original windows in an older home they will be more of an issue than the AC unit.

They are early in careers and not making high salary, so price sensitivity generally is an issue, rents go up too much they can and do leave for other buildings or other markets.Our projects are now entirely out of the millennial markets, serving a totally different population.If you are seeking to hold long term, or are attempting to build to a different demographic, then that should inform your unit mix.