UPPER FLOOR" which wasn't great but it's the best option support had for me.  

Now my main issue is I need a fire detection system in a enclosed back porch that leads up to all three floors, but I don't know what's the minimum I would need to be compliant or that the fire marshall is suggesting what he wants or recommends.

Expect to remodel kitchen and baths and put new floors down, paint, knock down a wall to open the floor plan. 

As we move into 2025, these trends are shaping how we approach renovations:Open Floor Plans with Purpose: Open concepts remain a top priority, but it’s no longer just about tearing down walls.

In a  Dplus area, 2nd floor unit, considering installing LVP. 

., new flooring, updated bathroom/kitchen fixtures)-Energy Efficiency Upgrades (e.g., solar panels)-Accessibility Modifications (e.g., ramps, widened doorways)-Luxury Items (e.g., pool)-LandscapingNot Acceptable Renovations:-Commercial Use (e.g., turning a residential property into a commercial property)-Temporary Structures-Non-Residential Buildings (e.g., barns, stables)FHA 203(k)Minimum Down Payment: 3.5%Minimum Credit Score: 620Minimum Loan Amount: $50,000Maximum Loan Amount: $524,225Occupancy Types: Primary Residence ONLYUnit Maximum: 4 UnitsAcceptable Renovations:-Structural Improvements/Reconstruction (e.g., adding rooms, bathrooms)-Cosmetic Enhancements-Eliminate Health and Safety Hazards-Energy Efficiency Improvements-Major Landscaping (e.g., grading, tree removal, adding walkways)Non-Acceptable Renovations:-Luxury Items-Commercial Use-Temporary Structures-Non-Residential BuildingsBoth of these renovation loans are similar in many ways, but the key differences are:1.

Licensed with permits ~$3,250.HWT standard gas single family low efficiency without exhaust retrofit $900.Sand and stain hardwood floors, natural stain $3 per sf.Paint interior walls, ceiling trim and doors 3 tone paint scheme 2 coats $3.20 per sf (floor area cost includes paint)Click lock LVT flooring install overlay inclusive of prep and quarter round $4.50 per sf (materials and labor)Asphalt roof installation 3/1 - 800 sf bungalow with 2 layers of shingles - ~$7,900Standard porch cap replacement with 2 new precast concrete steps ~$2,500Used stove or refrigerator delivery and install $350New stove or refrigerator delivery and install $HD model specificUse this as a general guideline. 

There would potentially be some weight issues with the 2nd+ floors of some shopping malls, depending on what the potential tenant wants to store in the upstairs unit. 

The property is livable, but I am account for a pretty significant turn in 4 - 7 years of paint, flooring, and any miscellaneous repairs that the inspector could have missed since it was occupied.

I think you are looking at the wrong places, insulating the floor wouldn't change much.