And because I live in the Washington, DC metro area, a very hot market, the rental income from that property alone provided considerable cash flow.My advice, since you know going into this you want to house-hack, pay attention to the layout of whatever properties you're considering, and factor in the costs of modifications that will be needed in order to make the rental portion of the property as private as possible. 

I charge for modifications, unauthorized painting, actual damage etc.. i find it hilariously funny how people always thing it’s cheap to do repairs and landlords overcharge.

I haven't had any complaints from tenants about this charge.The other softwares were pretty good, but here are the deal breakers for each.Tenant Cloud: Tenants cannot setup autopay unless we have the paid versionApartments.com: You cannot upload your own lease, you can only make modifications to their leaseAvail: You cannot upload your own lease, you can only make modifications to their leaseRentRedi: No free version AT THE TIME***I investigated these softwares 8-12 months ago, so some things could have changed.

Also, I'm concerned if the lender may stipulate any modifications to the property in order for them to deem it acceptable.

And so many people have NO clue as to what a short sale or modification is...they figure they have to make their 3+ skipped payments of 4x the current market value (broken into mtg payments) to get out of the mess or pay an attorney 5-10k upfront.BUT - you've got to catch them at the right time.

Some jurisdictions grandfather certain segments and won't allow any modification to the original footprints.  

If your state doesn't have such a form, then get one drafted by an attorney that you can use over and over with minor modifications. 

yes , I know that I will need to be diligent on my next move to see that the next deal will work with my numbers and not been negative then it will put me in a bad status. my HELOC is for 10 - 20 years with some modifications after the 10 yr but the interest on the HELOC is 5% so yes it is not low interest and I need to see that investment property that produce the correct numbers.  

Power modification?

Aside from that, IF you need to extend closing date, extend DD or any other modification to the original contract, then just send an amendment with those changes and get both the seller and the buyer on the original contract to sign, then send to your closing company.If you have dated something on the assignment of contract and need to extend that, then you can then send an amendment to the assignment.