If the tenant agrees you can alter the agreement or introduce a new one with the agreement of the tenant.

Two years alter I was likely making more than the professors.

A pre-ordinance (built before July 8, 1957) residential building or building of mixed residential occupancy, not complying with the requirements in force and applicable to the building at the time of its conversion, may be altered so as to legalize one dwelling unit, in addition to the number of dwelling units originally authorized, providing that said unit was determined by the office of the zoning administrator or the zoning board of appeals to have existed prior to July 8, 1957, and provided such building complies with the other provisions of this chapter.

There are in truth very few repair options or alterations that work well if you can't epoxy a chip along the edge of a granite countertop, and all of them require the skills of a granite specialist who really knows the work and therefore knows what his/her applied skills are worth.

LL/T law is very specific state by state and sometimes city by city.1) M2M rentals agreements may be altered or terminated with 30 days written notice. 

Also, you don't want the LLC to become your "alter-ego." 

But, one opinion is once you establish a pattern of using your personal name to get the loan, then switch Title, it could like you are using the LLC as your "alter-ego" thus piercing your corporate veil. 

I realize they both provide the leases to use, but I wasn't sure about altering them?

Even if there is i would assume that it can be altered or an addendum added.

You've got some major hurdles that will be quite challenging as a 1st time DIY project, and you will need licensed professionals to sign off on some things for permits: Structural (determining whether or not the wall you want to remove is load bearing and if so engineering a header and determining the framing layout for the new wall/door) Plumbing work will require a licensed plumber to pull the permitAny electrical alterations should be done by a licensed professional, a master electrician will be needed to pull a permitThere may be certain steps that you can DIY, such as GCing the project, demo, framing (following an engineer's drawings), sheet rock, tile, installing new fixtures/appliances, finishes, etc. but for the 3 big ones above you will need to bring in licensed pros if you're going to pull permits (which you definitely should).